The Ricta Clouds Transparent Citrus White 55mm, 78a wheels feature transparent citrus yellow urethane and white core, with debossed and pad printed lettering on our soft 78a urethane: perfect for cruising, filmer setups or skating rougher terrains. About Clouds 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. Ricta Clouds - Soft Skateboard Wheels For Every Terrain.