S6201ZZ Bearing, categorized as thick section, Double Metal Shields, radial and deep groove ball bearings,S6201ZZ bearing is made of Stainless Steel with Ceramic Balls (Si3N4) and Nylon Cage,S6201ZZ bearing is closed with 2 Metal Shields, one Shield from each side to protect the bearing from dust or any possible contamination,S6201ZZ bearing is sealed and self lubricated,the quality is set to EMQ (Premium ABEC-5 quality) to ensure high speed,S6201ZZ bearing is lubricated with grease.