In laboratories, and especially in the streets that were tested by Spitfire Team riders, the Formula Four Performance Urethane lasted longer, withstood more abuse and was superior to all other bikes. Spitfire Formula Four Urethane was developed to combine all the desired properties of a performance bike without sacrificing one attribute at the expense of another. Formula 4 is a durable urethane not only an advantage, but a combination of properties and properties that together create a really great bike. Also includes 1 random TGM Skateboards brand stickers.