Guaranteed to perform the original spitfire wheel designed and shaped by the pros who ride thempack of 4 wheels51mm99a durometerall spitfire wheels are hand poured shaped and specifically engineered in san francisco ca usaonly the most advanced formulas and compounds are used for all wheelswe achieve the highest levels in tolerance and true speedoften imitated and never duplicatedspitfire wheels are the standard by which all skateboard wheels are measured