Ricta Wheel Dynamics 57mm Clouds 78a Iridescent Blue featuring transparent pearlescent glitter urethane with black core, debossed and pad printed lettering. Super-soft urethane with stone ground riding surface for rough spots, cruiser setups, and general transportation. Ricta Clouds are the most diverse cruiser wheel family in skateboarding. With sizes from 52-60mm and 78a, 86a, and 92a durometers, Ricta makes a soft wheel for any terrain or setup.