This is a set of two RPM "Revolver" SC Spline Drive Short Course Truck Wheels, and are intended for use on the front of the Traxxas Slash 2WD truck. The most popular RPM wheel, the Revolver, is now available in a Short Course version (2.2” – 3.0”). RPM Revolver Short Course wheels are built tough, like all RPM products, look incredible and have an all-new drive system that is built to withstand some serious power.