... O Bonding:R/Resin Backing:J-weight Application:Less blockade, hard alloy surface soft grinding and polishing. JA636 Aluminum Oxide J- ... RollGrain:A/OBonding:R/ResinBacking:J-weight clothApplication:Less blockade, hard alloy surface soft grinding and polishing. Sharp and anticlogging. Gentle ... for water faucet, valve, sanitaryware, medical instruments, sports equipments, hard alloy, resin artwork, etc.