Spitfire's Formula Four technology combines not one specific attribute, but a number of technologies combined to bring you one of the most durable skate wheels on the market. They were rigorously developed by the Spitfire team with the aim of not sacrificing any specific quality at the expense of another. Spitfire are known to be one of the leaders in the skate wheel manufacturing industries.
This is a slightly softer wheel, which will give you some good speed at a skate park or ramp, and feel buttery over rough terrain. The classic shape of this wheel has proven to be the most popular worldwide.
Formula Four's are longer lasting, and hold their shape and size longer. They have unmatched abrasive resistance, so you get fewer flat spots. They are made in the U.S.A. so you can also be assured of their quality. Burn Four-Ever.