Team Associated 30101 TC4 Club Racer 4WD Touring Car Kit Pre-built "race roller" chassis ready to accept most 1:10 scale touring car electronics, bodies, wheels and tires Rear ball differential with lightweight composite outdrives Front spool to ensure maximum power delivery to all four wheels in low traction conditions 22 precision ball bearings included This vehicle comes assembled, but some additional items such as electronics and/or an engine/motor may be required