6905-2RS Ceramic Hybrid Ball Bearing C3 Chrome Steel and Ceramic Balls 6905-2RS Hybrid ceramic chrome steel sealed bearing Bearing with Si3N4 Ceramic Balls Electric motor quality, 6905-2RS Bearing is a popular size that could be used in many application that uses this size 25mm x 42mm x 9mm, each 6905-2RS bearing is closed with 2 Rubber Seals, bearing is double sealed, bearing is one seal from each side to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease, 6905-2RS Bearing has industrial packaging.