The ultimate bearing for inline, skate board or luge racers. Solid Si3N4 ceramic roller balls. Ceramic ABEC 7 bearings are used by the serious skater, speed boarder or luge racer.Size 688,mini bearing,8*16*5 Axle 8mm Rings Chromer steel Balls Si3N4 ceramic Cage Nylon Lubrication Speed master oil Seal/Shield Both sides sealed Color Black.Can be made as customer’s reuqest Class Ceramic ball bearing Logo Ceramic 688RS.Can be made as customer’s request

1, long life and resistance to wear - full ceramic bearing steel bearing fatigue life longer than expected 10-50 times, hybrid ceramic bearing, steel bearing life than the life span of 3-5 times higher;2, high speed and acceleration - can dn value of more than 3 million under the conditions of operation, and skidding, wear and heat can be reduced;3, corrosion-resistant - inert materials as ceramic materials, it is more corrosion and abrasion;