F1 Streetburners are a true flatspot resistant urethane that don't sacrifice the slide when you want it. The Spitfire F1SB Koston Froston Lager Purple Wheels are formulated to withstand any street terrain. An Eric Koston signature wheel. Pro Edition. None faster! 100DU. White wheel with graphics at one side. Sizes available as seen below. Available in colorways as seen below. Wheels sold in set of four.