This Pro Grade sandpaper has a No-Slip backing that won't slip or slide during use.Reduced hand fatigue. The sandpaper is clog resistant. The purple abrasive will not discolor the surface you are sanding. No-Slip Grip Backing provides longer sheet life 7-times longer than conventional sandpaper. For the best sanding results, sand with the grainof the wood and work through a sequence of grits, from coarse to ultra fine, skipping no more than one grit between sandpaper.