Build the derby car of your derams with the SUPER BLOCK 120: The body block is the foundation of any blazing fast car and Derby Champ's features holes drilled for perfect rear weight placement using our lead wire or tungsten cylinder and precision drilled axle holes for an extended wheelbase with 3 wheels on the track. Perfect or those who want to race with 3 wheels on the track (fastest) or use a Rail Rider(TM) alignment. For 4 wheels touching, we recomend the SUPER BLOCK 110. Wheels and axles are sold separately to give your car that winning edge!