6309ZZ Shielded Ball Bearing 45mm x 100mm x 25mm 6309ZZ Shielded Ball Bearing, material is Chrome steel, also 6314ZZ bearing is pre-lubricated with grease, 6314ZZ is Electric motor quality, each 6314ZZ bearings is closed with 2 Metal Shields, one Shield from each side, to protect the bearing from dust or any possible contamination, Bearings 6314ZZ has industrial packaging.