The Mustang pre-cut derby car body is made from an official pine derby car block so it meets all derby specifications: 7" long x 1.75" wide x 1.25" high. We did the hard part for you. Just do a little sanding, paint it, add wheels, axles, and weights of your choice (sold separately) to complete your car, and you are off to the races. We drilled two 3/8" weight holes in the rear of the Mustang so you can add cylinder weights inside the car body This car body will weigh 2 oz +/- 0.5oz. You will need from 1.5 to 2.5 oz of weight to bring it up to the 5 oz limit.