Fire Pit Glass Rocks, ~3/8-1/2" COBALT BLUE, 40 LBS Update your gas fireplace or fire pit with a clean, elegant look! Highest quality fire-glass on the market Product of Fireplace Glass San Diego Package contains 40 Lbs of ~3/8-1/2" Cobalt Blue Fireglass Rocks This glass has been tested and will not melt or discolor, if properly installed and used