Give your fireplace a new look with these natural fire resistant stones. These stones are heat resistant and will sustain heat generated by gas or ethanol systems (tested with positive results with units up to 90,000 BTUs). They are virtually maintenance free and long lasting.They can be used anywhere from your fireplaces, fire pits and garden .They are easy to install and can be used anywhere. .Each fire stone bag covers most standard-size fireplaces (±1 sq.ft. coverage), and weighs 18 to 20 lb.Stone size is approx 1inch to 2inch;. If you are unsure of how much you need or you need a different color or if you have any questions regarding these stones please feel free to send us a message. Please make sure to follow the fireplace or burner’s manufacturer’s recommendations before installation. It is recommended to keep all the opening clear and a clearance space around the burner. Wash with lukewarm water to clean any residue, oil or dirt. Colors shown here are for reference only. Actual stones may vary in size and color. Before making a purchase make sure with your fireplce or fire pit manufacturer that it is fit to be used with stones.Improper use may lead to undesired results such as stones turning black or bursting flame.