Bones offer some of the best performing, longest lasting wheels out there. The Street Tech Formula's are hard wheels for street and skatepark use. Perfect and fast on the concrete, but some how Bones STF wheels also offer control on more slippery surfaces. Get them and chances are you will not want anything else in the future. V5 Sidecut shape. Designed for less drag and longer grinds, plus the print will stay on for longer.