Stand out in the crowd with The Z BAR 320 w/slots: Cut low and thin with a sleek aerodynamic profile to increase speed, it's design has 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 pinewood derby car. Each car comes equipped with Axle slots for a standard wheel base and holes pre-drilled for perfect rear weight placement and balance point using our our lead wire or tungsten cylinder weights. Wheels and axles are sold separately to give your car that winning edge!