Scotch-Brite(TM) Cut and Polish Flap Brush, 8 in x 1 in x 4 in 5A MED, 3 per case Heavy duty for applications requiring higher polished finishes. Individual sheets adhered at a 90 degree angle to a core. Medium hardness 5 density. Abrasive mineral: Medium grade aluminum oxide. Color: Tan MOS: 4000 RPM