Adding a  1.5 lb bag of Peterson Gas Logs Vermiculite Granules to your Peterson gas log setup is the perfect way to finish off an already wonderful product. Vermiculite granules add a clean, finished look to the fireplace that enhance the beauty of the gas log set and add a unique element to the existing masonry. Please Note* This product is for use only with vented Peterson Flame Pan and Glowing Ember gas burners.