Pinewood Derby Car Kit Fast Speed Complete Ready to Assemble -Physics Lecture by Derby Dust Installed pinewood derby weight balanced -1 in front of rear axle for maximum potential energy. Underpocket for adjusting weight. Complete pienewood derby car kit including: tungsten putty, gap gauge, #44drill bit, graphite, wheel polishing swabs Reduced wood weight, wood removed at possible wheel rubbing spots on front end. Aerodynamic pinewood derby car body with lweight installed low to the ground for reduced drag and longer pushing down track. Machined Ready to race BSA Official Pinewood derby speed axles and wheels. Wheel Weight 2.46g per wheel.