3" Solid (No Hole) Hook and Loop (H&L) Abrasive Sanding Discs. 50-Pack. C-weight paper backing. Use with pneumatic orbital sanders and hand sanders. Quality standard abrasive gold sandpaper material is bonded with a hook and loop backing that secures evenly on your sander for easy application and removal. All purpose aluminum oxide paper works well with wood, softwood, hardwood, paint and finish, plastic, and solid surfaces. Open coating reduces loading and provides an even finish. Resin over resin bonding. Anti-static - reduces dust. Anti-clogging stearate provides extra heat resistance while reducing loading. Dry applications only.