*OUT OF ORIGINAL PACKAGING* Formula Four Performance Urethane lasts longer, withstands more abuse and performs superior to all other wheels. Spitfire Formula Four Urethane was developed to combine all the desired properties of a performance wheel without sacrificing any one attribute at the expense of another. Formula Four's True Lasting Performance Urethane comes not from a single benefit, but from a combination of qualities and features that together produce a truly great wheel.