3M™ Paper Belt 366UZ is constructed with our premium aluminum oxide mineral in closed coat format. It is an anti-static product that resists loading, and is coated on a heavy F-weight paper backing to efficiently sand and finish flat surfaces in woodworking applications. Heavy F-weight paper backing provides durability and smooth operation. Anti-static treatment helps manage dust and loading. Film media splice provides strong joint and smooth running belt in either direction. Premium aluminum oxide mineral provides aggressive cut and long abrasive life. Closed coat provides greater grain density and finer finish on hard woods than open coat abrasives.