Bristle DiscsScotch-Brite Roloc discs have bristles that conform to the contours of the workpiece without damaging base material. Designed to resist loading. Use with Roloc TR Disc Pads (sold separately).Bristle Disc, Diameter 1 In., Trim Length 5/8 In., Mounting Type Quick Change, Mounting Size Roll-On/Off (TR), 80 Grit, Abrasive Material Ceramic Aluminum Oxide, Yellow, Max. RPM 30, 000