3m Advanced Sandpaper Is Now Better Than Ever, Thanks To Our New No-Slip Grip Backing That Is Applied To The Back Of Our 3m Pro Grade Sandpaper. No-Slip Grip Backing Provides Longer Sheet Life - 7 Times Longer Than Conventional Sandpaper.this Pro Grade Sandpaper Has A No-Slip Backing That Won't Slip Or Slide During Use. Reduced Hand Fatigue.