Hydrogen 90mm wheels are designed for supreme athletic performance. Made in the USA. With a unique premium formula, the gathered inner core supports a urethane exterior, improving speed, mechanical grip and wear. Optimal performance, high speed and excellent wear, 90 mm / 85 A. Premium formula, resilience and bounce Solid core design, constant speed and curves Maximum grip, excellent vibration control. 8 wheels per set, bearings and spacers not included.