This is an optional Tekno R/C Front M6 Driveshaft Kit for the Traxxas Slash 4x4. FEATURES: Nylon and hardened steel construction Black in color INCLUDES: Two nylon steering blocks Two hardened steel drive cups Two nylon 12mm wheel hexes Two 6x12x4mm bearings Three .8mm washers Instruction sheet REQUIRES: Installation on Traxxas Slash lmm 6.17.10 ir/jxs