This is a test chassis for the Pinewood Derby. You can use it to check the condition of the axles and tires, select the best parts, and bend the axles to adjust the alignment. The axle holes are slightly small; enlarge them with a drill if necessary. The basic dimensions conform to standard competition regulations, with the rear having the maximum tread and the front having a narrower tread width. Also, the left side of the front wheel is 0.8mm higher and will not touch the ground. Ultimately, you should check and follow the regulations of the competition you are participating in.