These are the optional JConcepts Tense SC 12mm Hex Wheels Slash 4x4, Slash and Blitz. FEATURES: Nylon construction Black in color 12mm beefy hex design Can be used on front of the Traxxas Slash Can be used on front or rear of Slash 4x4 or HPI Blitz INCLUDES: Two Tense SC wheels REQUIRES: Tires and foam inserts SPECS: Outer Diameter: 2.97" (75.5mm) Width: 1.36" (34.5mm) Hex: 12mm lmm 6.18.10 ir/jxs