Kryptonics Replacement Rollerblade Inline Skate Bearings ABEC 3 SET OF 16 Standard Size 608 Bearing 16-Pack Set 8mm inner diameter, 22mm outer diameter, 7mm width Kryptonics Formula One bearings. intensive research and testing has resulted in the best bang for the buck bearings Kryptos formula one bearings are made to exacting specs and are the perfect compliment for any set of inline wheels Removable alloy shields for easy servicing - Brass retainers for lubricity and speed - Chrome steel SAW 52100 races for durability