Rubin 2 is designed to quickly shed wood fibers, eliminating clogging so the abrasive stays sharp, leading to a 30% faster removal rate, Since Rubin 2 is designed to prevent clogging due to the buildup of pitch and wood fibers, you'll get up to 30% longer life out of every sheet, Designed for rapid grit progression, spend less time getting from 80 to 220, achieving the best possible finished surface in the least amount of time, P80 Grit Sandpaper, Contains pack of 50