Stand out with a TWIN ARM SLIDER X 260: It has a sleek aerodynamic profile to increase speed. By design most of the wood is removed from the center of the car, which enables you to put more weight in the rear. This feature dramatically increases the potential energy of your derby car. Each car features holes drilled for perfect rear weight placement and balance using our lead wire or tungsten cylinders. Precision drilled axle holes for an extended wheelbase with 4 wheels on the track are perfect or those who want to race with 4 wheels on the track. For a 3 wheeler (faster) we recomend the TWIN ARM SLIDER X 270. Wheels and axles are sold separately to give your car that winning edge!