3M™ Green Corps™ Hookit™ Disc, 00515, 6 in, 40, 25 discs per carton, 5 cartons per case Min Qty Order:5 the pad has folded layers the pad has folded layers of abrasive cloth provide fresh mineral as the corners wear away and absorb vibration to reduce chatter for smooth results TOUGH ENOUGH FOR HEAVY DUTY USE: Combination of aluminum oxide grain and moderate conformability makes for a tough These discs are built on D and E weight paper backing and feature an open coat construction that reduces loading on fresh filler Ceramic aluminum oxide blend offers excellent cut rate and life for increased performance over traditional abrasives when sanding on metal