Blue Ridge Brand&Trade; Blue Reflective Fire Glass - 3-Pound Professional Grade Fire Pit Glass - 1/2" Reflective Glass for Fire Pit and Landscaping Reflective fire pit glass is tumbled to remove sharp edges. Perfect for fire pits, vase fillers, and garden landscapes. An economical and reusable choice - lasts longer than firewood. Glass will not melt, discolor, give off fumes, or break down. Fire pit glass pieces are .25" (6.35 mm) thick and range from approx. .25" to 1.25" (6.35 mm - 31.75 mm) in size.