Check the listing for details. Gas Fireplace Glowing Embers Rock Wool for Vent Free or Vented Gas Log Sets. Color: Rock Wool, Condition: New. Listed at 13.46 USD. Glowing Embers help create the look of smoldering wood embers and are designed for use with any VENTED gas log set; NG and LP. Enhance the look of your cozy fire place scene by adding this product to your ceramic log insert. When the flames hit the embers they glow red like real wood embers. For use with VENTED gas log sets only. According to California proposition 65, all products sold should be labeled with warning labels, so you will notice a warning label on the package, but don't be worry. All the products we sell is totally safe, which won't cause cancer, birth defects or other reproductive harm.You can use it safely. Compatible with NG and LP gas fireplace vented insert Includes 6 ounces of embers For use as an indoor decorative gas fireplace accessories with sand lava rock and log set Amazing platinum bright embers material creates a realistic glowing ember effect for your gas fireplace when the flames hit the embers Long lasting, should never need replacing