625ZZ Shielded Ball Bearings 5mm x 16mm x 5mm 625ZZ Shielded Ball Bearings, 625ZZ is made of Chrome steel, one Shield from each side, to protect the bearing from dust or any possible contamination, 625ZZ has Electric motor quality, each 625ZZ bearing is closed with 2 Metal Shields, also 625ZZ bearings are pre-lubricated with grease, Bearing 625ZZ has industrial packaging.