The Autobahn Chimera Dual Dero Wheels combine a hard inner core of 101a urethane and an outer tread of 97a urethane to create a smooth, stable ride on any terrain. The first (and still best) dual durometer skateboard wheel on the planet. Swirl urethane with clear cores. Graphics at one side. Sizes available as seen below. Available in colorways as seen below. Colors are limited to specific size. See colors below for correlating size. Wheels sold in set of four.