6204-2RS Hybrid Ceramic Sealed Ball Bearings 20mm x 47mm x 14mm 6204-2RS Bearing Hybrid ceramic chrome steel sealed bearing with ZrO2 Ceramic Balls Electric motor quality, each 6204-2RS bearing is closed with 2 Rubber Seals, double sealed and one seal from each side to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease, Bearing 6204-2RS has industrial packaging.