Diameter: 52mm Durometer: 92a Clouds Series Pack of 4 The soft urethane of Ricta Clouds are the perfect choice if you're skating a rough spot or just looking for a smoother ride. The 92a urethane is a happy medium that allows you to skate rough spots without compromising performance. Don't let a rugged spot get the best of you, set up Ricta Clouds and get to it. Ricta Clouds 92a Skateboard Wheels White/Black 52mm