1Best quality bearings 2high speed high precision and competitive prices 3have large in stock 4 24 hours online service 1. NSK Bearing CageM - copper alloy solid cage.T - synthetic resin cage.W - stamping cage.V - no cage.2. NSK bearing seals, dust coverZ, ZS - side with steel dust cover.ZZ, ZZS - both sides with steel dust cover.D, DU - side with a contact rubber seals.DD, DDU - both sides with ...