S6205ZZ Shielded Ball Bearing Premium ABEC-5 Quality with Si3N4 Ceramic Balls (Silicon Nitride) 25mm x 52mm x 15mm S6205ZZ Shielded, radial, deep groove ball bearing,S6205ZZ is made of Stainless Steel with Ceramic Balls (Si3N4) and Nylon Cage,S6205ZZ bearing is closed with 2 Metal Shields, one Shield from each side to protect the bearing from dust or any possible contamination,S6205ZZ bearing is sealed and self lubricated,the S6205ZZ inner diameter is 25mm, the S6205ZZ outer diameter is 52mm and the S6205ZZ width is 15mm, the quality is set to EMQ (Premium ABEC-5 quality) to ensure high speed,S6205ZZ bearings is lubricated with grease.