Special flange ball bearings

Skateboard Bearings categorized by the material of inner/outer races, the cage, the balls and the closures, usually rubber seals or metal shields, skateboard bearings fits all the longboards, skateboard bearings are also used in many skate applications like inline skate, roller hockey, rollerblades and street luge. Inner and Outer Race Material: Carbon, Chrome and Stainless steel are your options, ceramic are also an expensive option. Balls material: the bottom line is to reduce friction,  silicon nitride ceramic, Zirconia ceramic and steel. Retainer material: bakelite, nylon, bronze and steel. Lubrication: Iany multi-purpose oil, since a skateboarder can always take good care of his hardware, grease will make your wheels hard to free-spin, the stainless steel bearings can run dry and that would the best environment. Closures: used to protect the moving parts of your ball bearings from outside contaminations. If you are skateboarding in a perfect environment with no dirt, no water and no humidity; then you can always use your ball bearings without closures. Teflon seals, metal shields, non-contact rubber seals, and contact rubber seals