Spitfire Classics Formula Four 99 Duro - Various Sizes £60.00 Variants 52mm - Green - £60.00 53mm - Orange - £60.00 54mm - Silver - £60.00 55mm - Yellow - £60.00 56mm - Blue - £60.00 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.