Medium - Your classic wheel shape, versatile all-around wheel for street/park skating.
Smooth - Smooth wheels come with a shiny coating on the riding surface that feels grippy at first, but wears away quickly.
Rapido Formula - A perfect balance of speed and smooth control. Ricta's Rapido formula offers longer slides when you want it, and heightened control when you need it. Flat-spot resistance gives you a faster, smoother, and longer ride.
101a - Most common durometer offering a good balance between speed and grip. Meant for skateparks and other smooth surfaces.