Spitfire works with professional skateboarder Kader Sylla to bring the Kader Puffs Formula Four 54mm 99d Skateboard Wheels. These 54mm wheels feature Spitfire's latest Formula Four urethane design, offering smoother slides without a reduction in grip, and an exceptional flat spot resistance. The Conical cut design of these Kader Sylla pro wheels offer a superior lightweight construction and quick response time so you can pop higher tricks.