Scotch-Brite(TM) Roloc(TM) PD Surface Conditioning Disc TR, 3 in x NH A CRS, 25 per inner, 100 per case A lofty, open non-woven abrasive disc resistant to loading on soft and/or oily materials. A threaded attachment system secures the disc to the holder. Abrasive mineral: Coarse grade aluminum oxide. Color: Brown