Engineered with a premium, self-sharpening zirconia alumina abrasive, ProSand R811/R816/R831 coarse grit cloth portable belts deliver excellent cutting on any surface. Featuring anti-static and proprietary, patented grain technologies, these belts ensure a cleaner work environment and produce a super-fine scratch pattern and finish. When compared side by side to the next leading competing product, these durable belts cut faster and last.. See full description for further details