Build a bullet fast pinewood derby car by using our SUPER WEDGE X 132: Derby Champ's Super thin pine wedge features holes drilled for perfect rear weight placement and balance using our Slotted Tungsten Round (product #716) Weight that fit perfectly into the large center hole, and precision drilled axle holes for an extended wheelbase with 4 wheels on the track. Perfect or those who want to race with 4 wheels on the track. For a 3 wheeler (faster) we recomend the SUPER BLOCK X 133. Wheels and axles are sold separately to give your car that winning edge!