Spitfire Classics Formula Four 99 Duro - Various Sizes £50.00 Variants 52mm - Green - £50.00 53mm - Orange - £50.00 54mm - Silver - £50.00 55mm - Yellow - £50.00 56mm - Blue - £50.00 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.