【10 Pounds per Listing】Fire glass diameter is 0.67-0.79 inches (17-20mm), height is 0.35 inches (9mm). The material is glass, and each pack weighs 10 pounds. The color is shinny black 【Heat Resistant】The glass stones have a flat bottom and domed top. They can withstand temperatures of up to 1400 degrees Fahrenheit (about 752 degrees Celsius) and are safe for use in fireplaces 【Smooth and Safe to Touch】These glass rocks enhance the appearance of your fire pit by covering unsightly pipes, and gives texture and dimmension and color to flames 【Easy cleaning】Clean when glass is cool. Rinse with vinegar and water or use detergent and water to clean 【Wide Range of Uses】Suitable for indoor or outdoor fireplaces that use propane gas, natural gas, or electric.