Street Tech Formula (STF) is specifically engineered from top quality components to obtain all the best properties necessary for the ultimate in street wheel performance. BONES WHEELS has created a wheel with a substantially higher rebound for more speed and amazing slide capabilities while maintaining a resistance to flat spotting well beyond any standard wheel. The technology behind STF is proven. The results speak for themselves. Hype is hype, ?ï¾?quality?ï¾ is for real. Try Street Tech Formula wheels on your next setup and see for yourself. Also Includes a set of Independent Abec 7 Bearings. Featuring removable non-contact labyrinthe shields, grit blocking cage, stainless steel races and balls. Set of 8 bearings with spacers and SpeedRings.