Scotch-Brite(TM) Roloc(TM) EXL Unitized Wheel TS, 2 in x NH 8A MED, 60 per case High performance and durability for deburring and finishing applications. An attachment system screws onto the holder. Hard 8 density offers good edge retention. Abrasive mineral: Medium grade aluminum oxide. Color: Tan MOS: 22100 RPM