This is a set of Spitfire F4 OG Classics 54mm 99a Skateboard Wheels

The original Spitfire wheel was designed and shaped by the pros who ride them.Formula Four Urethane –Unmatched abrasion resistance for fewer flat spots. More controllable grip. Lasting speed no matter the terrain. Smooth anti-slick slide and a longer-lasting size and shape. The 99a durometer offers more grip than harder wheels and more slide than softer wheels. Great for slick surfaces when you want more control.