Designed with the top quality Formula Four urethane, the Eternals Radial Full Spitfire skateboard wheels are sure to last a while. They have a 56mm width and a 99a hardness rating allowing them to not only resist flat spots but to also keep your speed over rough terrain. Plus, because of the anti-stick element they've been made with, you'll have a more consistent slide on ledges, rails, or anything you see fit to grind.