Set of 4 Ricta Rapido Slim Skateboard Wheels in 54mm 99a, Ricta’s Rapido formula is their most balanced to date and provides maximum speed with smooth control. Rapido wheels guarantee a longer roll with fewer flat spots and offer longer slides when you want it and more control when you need it. The Slim profile minimizes drag for smoother and longer slides, they are also lighter for a quicker response.