This two-inch diameter quick-change sanding disc has YF-weight polyester backing that is water-resistant. This roll-on disc has 24 grit aluminum oxide abrasive and can be run wet or dry. It is resin-bonded for heat resistance. This sanding disc is perfect for use in welding, metalworking, and in maintenance, repairs, and operations. It can withstand grinding speeds up to 25,000 RPM.