Razor Ultra Pro Series Pro Bearings (set of 4) Take it to the next level with the Razor Ultra Pro series scooter accessories Transform your pro scooter the way you've always wanted! High Speed RZR pro bearings come in a set of 4 Top of the line replacement pro wheels bearings Compatible with all hubs using 608 size (8mm x 22mm) inline bearings, including 98mm, 100mm, 110mm, and 120mm scooter wheels