Finish Faster - Rubin 2 is designed to quickly shed wood fibers, eliminating clogging so the abrasive stays sharp, leading to a 30% faster removal rate. Save Money - 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. Your Best Finish - Designed for rapid grit progression, you’ll spend less time getting from 80 to 220, achieving the best possible finished surface in the least amount of time. Best for bare wood.