Wider riding surface for stability and more controlled slides with conical edge for better lock ins on coping. Ricta Rapido urethane is our most balanced formula for maximum speed and smooth roll. Rapido urethane slides when you want it and gives you control when you need it. Our longest lasting urethane with fewer flat spots. 54mm 101A Hardness Wheel width: 35.9mm Wheel Contact Patch: 21.1mm White urethane Nyjah Huston Pro Wheel Wide shape Set of 4