Margo Garden Products Green Landscape Glass is ideal for landscapes and for use in propane and natural gas fire applications. All glass lava rocks are tumbled to produce smooth edges for landscaping while also tempered to withstand high temperatures. These glass pc. are created through an industry - leading manufacturing process to ensure each piece will maintain form and color for years to highlight all indoor and outdoor environments. The landscape/fire pit stones are complemented by a bag designed for easy handling to apply and store for all sized projects. Half-inch landscape glass is recommended over quarter-inch landscape glass for propane and natural gas fire applications. Feature decorative glass stones for fire pits, landscapes, aquariums, floral arrangements, water features and to embed in decorative mosaics and stone works to impress all with its durability, charm and decor.