The Spitfire Lizard King Primal Mash Up Wheels are quality guaranteed. Spitfire is the world's #1 urethane for a reason... performance. All Spitfire wheels are hand poured, shaped and specifically engineered in San. Francisco, CA., USA. Only the most advanced formulas and compounds are used for all wheels. We achieve the highest levels in tolerance and true speed. Often imitated and never duplicated, Spitfire wheels are the standard by which all wheels are measured. Ride the fire.