Rupes P3000 and P2000 adhesive sanding discs are designed to be used for sanding with your Rupes I-Brid polisher. These disc are replacements for the discs that were originally provided with the kit. These sanding discs adhere directly to the Rupes 34mm (1.25) sanding backing plate. These discs are available in 3000 grit and 2000 grit.