6818-2RS Sealed Ball Bearing 90mm x 115mm x 13mm 6818-2RS Sealed Ball Bearing is radial, deep groove ball bearing,bearing is made of Chrome Steel with chrome steel balls and steel cage,6818-2RS bearing is closed with rubber seals to protect the bearing from dust or any possible contamination,bearing is sealed and self lubricated,the quality is set to EMQ (electric motor quality),6818-2RS bearing is lubricated with grease.