node_modules/material-design-lite/src/radio/snippets/radio-off.html

<label class="mdl-radio mdl-js-radio mdl-js-ripple-effect" for="option-2">
  <input type="radio" id="option-2" class="mdl-radio__button" name="options" value="2">
  <span class="mdl-radio__label">Second</span>
</label>