The 4-Inch, Black Skyflame Ceramic Fire Balls Are A Set Of Twelve Round Fire Premium Quality --- The 4-inch ceramic fire spheres made of high quality materials, burn clean with no smoke, smell or ash, and prevent wear over years of use. Fireproof Design --- Designed especially for use as fire media, these heat resistant spheres can withstand temperatures up to 800-1000C. Show Your Creativity ---Recommended to fill in our fire glass and fire rock, the mix-and-match possibilities are endless, bring a fun, modern element look to your dated fire pit or fireplace. Widely Compatibility --- The ceramic fireballs are safe for your home or business, in indoor or outdoor fire pits and fireplaces. Works great with Natural Gas and Propane. Tips --- The ceramic fire ball may produce dust during transportation, and may accumulate carbon during use due to insufficient combustion, use a brush to gently brush away the carbon ash.(Fireballs are not waterproof, do not use water to clean the fireballs)