6800DDU Sealed Ball Bearing is radial, deep groove ball bearing, 6800DDU bearing is made of Chrome Steel with chrome steel balls and steel cage, bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, 6800DDU bearing is sealed and self lubricated, the quality is set to EMQ (electric motor quality) to ensure high speed, 6800DDU bearing is lubricated with greased.