3M STIKIT 6″ RED ABRASIVE SANDING DISC ROLL 316U – This Stikit disc roll uses aluminum oxide on an “A” weight paper backing. The 316U is recommended for use on paint, primer, metal, wood and fiberglass. Use for fine featheredging or last final sanding step before priming. Disc is 6″ x NH. Product is sold by the roll of 100 discs.