6220LLU Sealed, radial, deep groove ball bearing,6220LLU 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,6220LLU bearing is sealed and self lubricated,the quality is set to EMQ (electric motor quality) to ensure high speed,6220LLU bearing is lubricated with grease.