The Spitfire Formula Four 99a Skate Like A Girl OG Classic Skateboard Wheels delivers Formula Four Performance Urethane that resists flat spots and outlasts other wheels through abuse, while 99a hardness and exclusive anti-stick compound provide faster speeds and consistent slides that won't mush out over time. With 100% pure urethane construction and higher rebound that handles both rough streets and smooth parks, these wheels prove you don't need to sacrifice durability for speed when the chemistry is dialed.