Spitfire Classics Formula Four 99 Duro - Various Sizes £59.99 Variants 52mm - Green - £59.99 53mm - Orange - £59.99 54mm - Silver - £59.99 55mm - Yellow - £59.99 56mm - Blue - £59.99 Quantity Add to Cart This variant is currently sold out Please fill in the form below if you'd like to be notified when it becomes available. Your Email The #1 Shape in skateboarding worldwide - proven for speed and control.