3M™ Trizact™ cloth band 237AA uses proprietary micro replication technology by 3M™ where micron graded aluminum oxide particles are formed into tiny pyramids of abrasive mineral and then coated on an X-weight cloth backing. As these pyramids wear, fresh, sharp mineral is continually exposed to produce a consistent cut and a predictable, fine finish. Trizact™ 7010361980, Series: 237AA, 0.531 in Band Diameter, 1 in Band Length, A80 Grit, Aluminum Oxide Abrasive, Cloth Backing, Applicable Materials: Aluminum, Carbon Steel, High Nickel Alloy, Soft Metals, Stainless Steel, Titanium and Zirconium, X-Weight Backing Weight, Gray