●DURABLE FOR MILES OF USE - The Radar Energy 57 roller skate wheels durable urethane will give you long-lasting grip whether on a rink, sidewalk, or street. ●ENGINEERED FOR AGILITY - These outdoor recreation skate wheels are small for transitions and tricks on various types of outdoor surfaces. ●SMOOTH RIDE FOR CARE-FREE SKATING - These versatile skating wheels roll smooth to help improve the comfort of your ride. The Radar Energy 57 wheels from Riedell can upgrade your skates or be future replacements. ●INCREDIBLY RESPONSIVE TO YOU - The Radar Energy 57 skate wheel has a Micro hub that helps make for a responsive and smooth ride. The Radar Energy 57 offers excellent handling for trail skating. ●MATCH YOUR SKATES - These skates wheel come with a 78A hardness and in a compact 31 mm x 57 mm size. This product is not a childrens product and is not designed or intended for use by children 12 years of age or younger.