diff --git a/src/radio/radio.js b/src/radio/radio.js
index 75173099..72ddce75 100644
--- a/src/radio/radio.js
+++ b/src/radio/radio.js
@@ -15,255 +15,252 @@
  * limitations under the License.
  */
 
-/**
- * Class constructor for Radio MDL component.
- * Implements MDL component design pattern defined at:
- * https://github.com/jasonmayes/mdl-component-design-pattern
- * @param {HTMLElement} element The element that will be upgraded.
- */
-function MaterialRadio(element) {
+(function() {
   'use strict';
 
-  this.element_ = element;
+  /**
+   * Class constructor for Radio MDL component.
+   * Implements MDL component design pattern defined at:
+   * https://github.com/jasonmayes/mdl-component-design-pattern
+   *
+   * @param {HTMLElement} element The element that will be upgraded.
+   */
+  var MaterialRadio = function MaterialRadio(element) {
+    this.element_ = element;
 
-  // Initialize instance.
-  this.init();
-}
+    // Initialize instance.
+    this.init();
+  };
+  window.MaterialRadio = MaterialRadio;
 
-/**
- * Store constants in one place so they can be updated easily.
- * @enum {string | number}
- * @private
- */
-MaterialRadio.prototype.Constant_ = {
-  TINY_TIMEOUT: 0.001
-};
+  /**
+   * Store constants in one place so they can be updated easily.
+   *
+   * @enum {String | Number}
+   * @private
+   */
+  MaterialRadio.prototype.Constant_ = {
+    TINY_TIMEOUT: 0.001
+  };
 
-/**
- * Store strings for class names defined by this component that are used in
- * JavaScript. This allows us to simply change it in one place should we
- * decide to modify at a later date.
- * @enum {string}
- * @private
- */
-MaterialRadio.prototype.CssClasses_ = {
-  IS_FOCUSED: 'is-focused',
-  IS_DISABLED: 'is-disabled',
-  IS_CHECKED: 'is-checked',
-  IS_UPGRADED: 'is-upgraded',
-  JS_RADIO: 'mdl-js-radio',
-  RADIO_BTN: 'mdl-radio__button',
-  RADIO_OUTER_CIRCLE: 'mdl-radio__outer-circle',
-  RADIO_INNER_CIRCLE: 'mdl-radio__inner-circle',
-  RIPPLE_EFFECT: 'mdl-js-ripple-effect',
-  RIPPLE_IGNORE_EVENTS: 'mdl-js-ripple-effect--ignore-events',
-  RIPPLE_CONTAINER: 'mdl-radio__ripple-container',
-  RIPPLE_CENTER: 'mdl-ripple--center',
-  RIPPLE: 'mdl-ripple'
-};
+  /**
+   * Store strings for class names defined by this component that are used in
+   * JavaScript. This allows us to simply change it in one place should we
+   * decide to modify at a later date.
+   *
+   * @enum {String}
+   * @private
+   */
+  MaterialRadio.prototype.CssClasses_ = {
+    IS_FOCUSED: 'is-focused',
+    IS_DISABLED: 'is-disabled',
+    IS_CHECKED: 'is-checked',
+    IS_UPGRADED: 'is-upgraded',
+    JS_RADIO: 'mdl-js-radio',
+    RADIO_BTN: 'mdl-radio__button',
+    RADIO_OUTER_CIRCLE: 'mdl-radio__outer-circle',
+    RADIO_INNER_CIRCLE: 'mdl-radio__inner-circle',
+    RIPPLE_EFFECT: 'mdl-js-ripple-effect',
+    RIPPLE_IGNORE_EVENTS: 'mdl-js-ripple-effect--ignore-events',
+    RIPPLE_CONTAINER: 'mdl-radio__ripple-container',
+    RIPPLE_CENTER: 'mdl-ripple--center',
+    RIPPLE: 'mdl-ripple'
+  };
 
-/**
- * Handle change of state.
- * @param {Event} event The event that fired.
- * @private
- */
-MaterialRadio.prototype.onChange_ = function(event) {
-  'use strict';
-
-  // Since other radio buttons don't get change events, we need to look for
-  // them to update their classes.
-  var radios = document.getElementsByClassName(this.CssClasses_.JS_RADIO);
-  for (var i = 0; i < radios.length; i++) {
-    var button = radios[i].querySelector('.' + this.CssClasses_.RADIO_BTN);
-    // Different name == different group, so no point updating those.
-    if (button.getAttribute('name') === this.btnElement_.getAttribute('name')) {
-      radios[i].MaterialRadio.updateClasses_();
+  /**
+   * Handle change of state.
+   *
+   * @param {Event} event The event that fired.
+   * @private
+   */
+  MaterialRadio.prototype.onChange_ = function(event) {
+    // Since other radio buttons don't get change events, we need to look for
+    // them to update their classes.
+    var radios = document.getElementsByClassName(this.CssClasses_.JS_RADIO);
+    for (var i = 0; i < radios.length; i++) {
+      var button = radios[i].querySelector('.' + this.CssClasses_.RADIO_BTN);
+      // Different name == different group, so no point updating those.
+      if (button.getAttribute('name') === this.btnElement_.getAttribute('name')) {
+        radios[i].MaterialRadio.updateClasses_();
+      }
     }
-  }
-};
+  };
 
-/**
- * Handle focus.
- * @param {Event} event The event that fired.
- * @private
- */
-MaterialRadio.prototype.onFocus_ = function(event) {
-  'use strict';
+  /**
+   * Handle focus.
+   *
+   * @param {Event} event The event that fired.
+   * @private
+   */
+  MaterialRadio.prototype.onFocus_ = function(event) {
+    this.element_.classList.add(this.CssClasses_.IS_FOCUSED);
+  };
 
-  this.element_.classList.add(this.CssClasses_.IS_FOCUSED);
-};
+  /**
+   * Handle lost focus.
+   *
+   * @param {Event} event The event that fired.
+   * @private
+   */
+  MaterialRadio.prototype.onBlur_ = function(event) {
+    this.element_.classList.remove(this.CssClasses_.IS_FOCUSED);
+  };
 
-/**
- * Handle lost focus.
- * @param {Event} event The event that fired.
- * @private
- */
-MaterialRadio.prototype.onBlur_ = function(event) {
-  'use strict';
+  /**
+   * Handle mouseup.
+   *
+   * @param {Event} event The event that fired.
+   * @private
+   */
+  MaterialRadio.prototype.onMouseup_ = function(event) {
+    this.blur_();
+  };
 
-  this.element_.classList.remove(this.CssClasses_.IS_FOCUSED);
-};
+  /**
+   * Update classes.
+   *
+   * @private
+   */
+  MaterialRadio.prototype.updateClasses_ = function() {
+    this.checkDisabled();
+    this.checkToggleState();
+  };
 
-/**
- * Handle mouseup.
- * @param {Event} event The event that fired.
- * @private
- */
-MaterialRadio.prototype.onMouseup_ = function(event) {
-  'use strict';
+  /**
+   * Add blur.
+   *
+   * @param {Event} event The event that fired.
+   * @private
+   */
+  MaterialRadio.prototype.blur_ = function(event) {
 
-  this.blur_();
-};
+    // TODO: figure out why there's a focus event being fired after our blur,
+    // so that we can avoid this hack.
+    window.setTimeout(function() {
+      this.btnElement_.blur();
+    }.bind(this), this.Constant_.TINY_TIMEOUT);
+  };
 
-/**
- * Update classes.
- * @private
- */
-MaterialRadio.prototype.updateClasses_ = function() {
-  'use strict';
-  this.checkDisabled();
-  this.checkToggleState();
-};
+  // Public methods.
 
-/**
- * Add blur.
- * @private
- */
-MaterialRadio.prototype.blur_ = function(event) {
-  'use strict';
-
-  // TODO: figure out why there's a focus event being fired after our blur,
-  // so that we can avoid this hack.
-  window.setTimeout(function() {
-    this.btnElement_.blur();
-  }.bind(this), this.Constant_.TINY_TIMEOUT);
-};
-
-// Public methods.
-
-/**
-* Check the components disabled state.
-* @public
-*/
-MaterialRadio.prototype.checkDisabled = function() {
-  'use strict';
-  if (this.btnElement_.disabled) {
-    this.element_.classList.add(this.CssClasses_.IS_DISABLED);
-  } else {
-    this.element_.classList.remove(this.CssClasses_.IS_DISABLED);
-  }
-};
-
-/**
-* Check the components toggled state.
-* @public
-*/
-MaterialRadio.prototype.checkToggleState = function() {
-  'use strict';
-  if (this.btnElement_.checked) {
-    this.element_.classList.add(this.CssClasses_.IS_CHECKED);
-  } else {
-    this.element_.classList.remove(this.CssClasses_.IS_CHECKED);
-  }
-};
-
-/**
- * Disable radio.
- * @public
- */
-MaterialRadio.prototype.disable = function() {
-  'use strict';
-
-  this.btnElement_.disabled = true;
-  this.updateClasses_();
-};
-
-/**
- * Enable radio.
- * @public
- */
-MaterialRadio.prototype.enable = function() {
-  'use strict';
-
-  this.btnElement_.disabled = false;
-  this.updateClasses_();
-};
-
-/**
- * Check radio.
- * @public
- */
-MaterialRadio.prototype.check = function() {
-  'use strict';
-
-  this.btnElement_.checked = true;
-  this.updateClasses_();
-};
-
-/**
- * Uncheck radio.
- * @public
- */
-MaterialRadio.prototype.uncheck = function() {
-  'use strict';
-
-  this.btnElement_.checked = false;
-  this.updateClasses_();
-};
-
-/**
- * Initialize element.
- */
-MaterialRadio.prototype.init = function() {
-  'use strict';
-
-  if (this.element_) {
-    this.btnElement_ = this.element_.querySelector('.' +
-        this.CssClasses_.RADIO_BTN);
-
-    var outerCircle = document.createElement('span');
-    outerCircle.classList.add(this.CssClasses_.RADIO_OUTER_CIRCLE);
-
-    var innerCircle = document.createElement('span');
-    innerCircle.classList.add(this.CssClasses_.RADIO_INNER_CIRCLE);
-
-    this.element_.appendChild(outerCircle);
-    this.element_.appendChild(innerCircle);
-
-    var rippleContainer;
-    if (this.element_.classList.contains(
-        this.CssClasses_.RIPPLE_EFFECT)) {
-      this.element_.classList.add(
-          this.CssClasses_.RIPPLE_IGNORE_EVENTS);
-      rippleContainer = document.createElement('span');
-      rippleContainer.classList.add(
-          this.CssClasses_.RIPPLE_CONTAINER);
-      rippleContainer.classList.add(this.CssClasses_.RIPPLE_EFFECT);
-      rippleContainer.classList.add(this.CssClasses_.RIPPLE_CENTER);
-      rippleContainer.addEventListener('mouseup', this.onMouseup_.bind(this));
-
-      var ripple = document.createElement('span');
-      ripple.classList.add(this.CssClasses_.RIPPLE);
-
-      rippleContainer.appendChild(ripple);
-      this.element_.appendChild(rippleContainer);
+  /**
+   * Check the components disabled state.
+   *
+   * @public
+   */
+  MaterialRadio.prototype.checkDisabled = function() {
+    if (this.btnElement_.disabled) {
+      this.element_.classList.add(this.CssClasses_.IS_DISABLED);
+    } else {
+      this.element_.classList.remove(this.CssClasses_.IS_DISABLED);
     }
+  };
 
-    this.btnElement_.addEventListener('change', this.onChange_.bind(this));
-    this.btnElement_.addEventListener('focus', this.onFocus_.bind(this));
-    this.btnElement_.addEventListener('blur', this.onBlur_.bind(this));
-    this.element_.addEventListener('mouseup', this.onMouseup_.bind(this));
+  /**
+   * Check the components toggled state.
+   *
+   * @public
+   */
+  MaterialRadio.prototype.checkToggleState = function() {
+    if (this.btnElement_.checked) {
+      this.element_.classList.add(this.CssClasses_.IS_CHECKED);
+    } else {
+      this.element_.classList.remove(this.CssClasses_.IS_CHECKED);
+    }
+  };
 
+  /**
+   * Disable radio.
+   *
+   * @public
+   */
+  MaterialRadio.prototype.disable = function() {
+    this.btnElement_.disabled = true;
     this.updateClasses_();
-    this.element_.classList.add(this.CssClasses_.IS_UPGRADED);
-  }
-};
+  };
 
-// The component registers itself. It can assume componentHandler is available
-// in the global scope.
-componentHandler.register({
-  constructor: MaterialRadio,
-  classAsString: 'MaterialRadio',
-  cssClass: 'mdl-js-radio',
-  widget: true
-});
+  /**
+   * Enable radio.
+   *
+   * @public
+   */
+  MaterialRadio.prototype.enable = function() {
+    this.btnElement_.disabled = false;
+    this.updateClasses_();
+  };
+
+  /**
+   * Check radio.
+   *
+   * @public
+   */
+  MaterialRadio.prototype.check = function() {
+    this.btnElement_.checked = true;
+    this.updateClasses_();
+  };
+
+  /**
+   * Uncheck radio.
+   *
+   * @public
+   */
+  MaterialRadio.prototype.uncheck = function() {
+    this.btnElement_.checked = false;
+    this.updateClasses_();
+  };
+
+  /**
+   * Initialize element.
+   */
+  MaterialRadio.prototype.init = function() {
+    if (this.element_) {
+      this.btnElement_ = this.element_.querySelector('.' +
+          this.CssClasses_.RADIO_BTN);
+
+      var outerCircle = document.createElement('span');
+      outerCircle.classList.add(this.CssClasses_.RADIO_OUTER_CIRCLE);
+
+      var innerCircle = document.createElement('span');
+      innerCircle.classList.add(this.CssClasses_.RADIO_INNER_CIRCLE);
+
+      this.element_.appendChild(outerCircle);
+      this.element_.appendChild(innerCircle);
+
+      var rippleContainer;
+      if (this.element_.classList.contains(
+          this.CssClasses_.RIPPLE_EFFECT)) {
+        this.element_.classList.add(
+            this.CssClasses_.RIPPLE_IGNORE_EVENTS);
+        rippleContainer = document.createElement('span');
+        rippleContainer.classList.add(
+            this.CssClasses_.RIPPLE_CONTAINER);
+        rippleContainer.classList.add(this.CssClasses_.RIPPLE_EFFECT);
+        rippleContainer.classList.add(this.CssClasses_.RIPPLE_CENTER);
+        rippleContainer.addEventListener('mouseup', this.onMouseup_.bind(this));
+
+        var ripple = document.createElement('span');
+        ripple.classList.add(this.CssClasses_.RIPPLE);
+
+        rippleContainer.appendChild(ripple);
+        this.element_.appendChild(rippleContainer);
+      }
+
+      this.btnElement_.addEventListener('change', this.onChange_.bind(this));
+      this.btnElement_.addEventListener('focus', this.onFocus_.bind(this));
+      this.btnElement_.addEventListener('blur', this.onBlur_.bind(this));
+      this.element_.addEventListener('mouseup', this.onMouseup_.bind(this));
+
+      this.updateClasses_();
+      this.element_.classList.add(this.CssClasses_.IS_UPGRADED);
+    }
+  };
+
+  // The component registers itself. It can assume componentHandler is available
+  // in the global scope.
+  componentHandler.register({
+    constructor: MaterialRadio,
+    classAsString: 'MaterialRadio',
+    cssClass: 'mdl-js-radio',
+    widget: true
+  });
+})();