Silicon carbide is the best abrasive for sanding glass, marble tile, stone, rubber, fiberglass, composites, laminates and more. A&H Abrasives belts are made from the finest quality materials. The premium grade friable Silicon Carbide is harder and sharper than Aluminum Oxide and will breakdown, and cut faster under lighter preasure. The abrasive is bonded to the Y-weight polyester backing with industrial strength proprietary resins in a closed coat (100% grain coverage) arrangement to allow maximum stock removal. The Y-weight backing is water proof and tear resistant. The belts feature bi-directional, high-strength, no-bump, urethane-bonded Mylar butt joints that can be run in either direction increasing the total service life of the belt. Made in Wyoming, USA with components from USA and Korea. Premium Silicon Carbide grain delivers sharp and durable performance. Resin bond anchors the abrasive to the backing for longer belt life. Heavy Y-weight polyester backing is tear resistant and water proof to increase belt life. The best belts for sanding glass, marble tile, stone, rubber, fiberglass, and more. Bi-directional, high-strength, no-bump, urethane-bonded Mylar(R) butt joints.