Scotch-Brite(TM) Roloc(TM) Surface Conditioning Disc TSM, 3 in x NH S SFN, 25 per inner 100 per case A non-woven abrasive product used for cleaning, finishing, blending and deburring applications. A metal attachment system screws onto the holder. Abrasive mineral: Super fine grade silicon carbide. Color: Gray MOS: 18000 RPM