608ZZ Sealed Inline Ball Bearings 8mm x 22mm x 7mm Set of 100 Bearings 608ZZ Sealed Inline Ball Bearings, 608ZZ is a popular size that is used for Skateboards, in-line skate, roller blade and even scooters. each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, these are self lubricated bearings (bearings are already oiled)608ZZ bearings are made of Carbon Steel, 608ZZ bearings are closed with metal shields to protect the bearing from dust or any possible contamination, 608ZZ Bearings are self lubricated bearings (bearings are already oiled), 608ZZ is one of the most common widely used bearing, we always suggest mechanical engineers to use 608ZZ in their designs, 608ZZ is economic and standard and 608ZZ is one of the most common bearing used in hundreds of applications