Check the listing for details. Premium BLACK 1/2" Reflective Tempered Fire Glass for Fireplace and Fire Pit. Color: Black, Condition: New. Listed at 11.78 USD. Add a touch of elegance to your fireplace or fire pit with this Premium Black 1/2" Reflective Tempered Fire Glass. Crafted from high-quality glass, this product is perfect for those who want to enhance their fireplace experience. The natural gas and propane power source ensures that you can enjoy your fire for a long time. The black color of the glass adds a classic touch to any room, while the reflective finish enhances the overall look of your fireplace. This fire glass is ideal for anyone who wants to add a touch of sophistication to their home decor. Whether you're relaxing by the fire or entertaining guests, this fire glass is sure to impress. 1/2" Premium Reflective Fire Glass Modern replacement for fire logs and lava rock. Decorative addition to vases and flower pots. For reference, 10lbs of fire glass approximately fills a 6" x 6" x 6" cube, or slightly less than a gallon. How much do you need? Round Fire Pits Multiply the diameter by the diameter. Multiply that by the depth.Divide that by 25. For example, a 24" diameter fire pit with a depth of 3": 24 x 24 = 576576 x 3 = 17281728 / 25 ≈ 70lbs Rectangle & Square Fire Pits Multiply the Length, the Width, and Height.Divide that by 22.5. For example, a fire pit that is 36" long, 16" wide, and 3" deep: 36 x 16 x 3 = 17281728 / 22.5 ≈ 77lbs