609ZZ Shielded Ball Bearings 20 Ball Bearing 609ZZ Shielded Ball Bearings, 609ZZ is made of Chrome steel, 609ZZ has Electric motor quality, each 609ZZ bearings is closed with 2 Metal Shields, one Shield from each side to protect the bearing from dust or any possible contamination, also 609ZZ bearings are pre-lubricated with grease, Bearings 609ZZ have industrial packaging.