Features: Price is for a set of Four Wheels. 56mm height diameter x 37mm width with a 21.5mm riding surface. 97a hardness rating. Soft grippy 97A hardness rating suitable for cruisers and all terrains. Slimeball formula blend is poured in a reversible dead center bearing and no flex edge radius lip design. Renound Santa Cruz high quality poured 100% urethane.