The Rollerblade Hydrogen SE 90mm Inline Skate Wheels 8-Pack offers an enhancement to your skating adventure. Built from robust urethane, these wheels improve speed and traction. The twin 6 flow core interface provides rigidity, and the ILQ-9 bearings guarantee smooth, rapid rotations. To ensure ease of use, this set comes preassembled with 8 wheels, 16 bearings, and 8 spacers. Achieve exceptional performance with every journey!