3m Advanced Sandpaper Is Now Better Than Ever, Thanks To Our 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. For The Best Sanding Results, Sand With The Grain Of The Wood And Work Through A Sequence Of Grits, From Coarse To Ultra Fine, Skipping No More Than 1-Grit Between Sandpaper.