Spitfire 52mm 99DU Formula Four Gonz Shmoos Skateboard Wheels Natural • Spitfire Mark Gonzales Pro skateboard wheels• 52mm• 99DU hard skateboard wheels• Classic shape• Natural urethane• Set of Four• Formulated for a harder-faster ride• Unmatched flatspot resistance• Smooth anti-stick slide• More speed and control• 100% True performance urethane More from Spitfire at Slam City Skates More Skateboard Wheels Spitfire 52mm 99DU Formula Four Gonz Shmoos Skateboard Wheels Natural