6303ZZ Shielded Ball Bearing 17mm x 47mm x 14mm 6303ZZ Shielded Ball Bearing, material is Chrome steel, 6303ZZ is Electric motor quality, each 6303ZZ bearings is closed with 2 Metal Shields, one Shield from each side, to protect the bearing from dust or any possible contamination, also 6303ZZ bearing is pre-lubricated with grease, Bearings 6303ZZ has industrial packaging.