Margo Garden Products Black Reflective Fire Glass is ideal for all propane or natural gas fire applications. Our glass lava rocks are richly colored to appeal in indoor and outdoor venues and tempered to withstand the most extreme temperatures of fireplaces and fire pits. These fire pit glass stones are created through an industry-leading manufacturing process to ensure each piece will maintain form and vibrant color. Feature reflective tempered glass in fire pits and fireplaces to impress all with its durability, charm and decor.