The Fender Kit contains two pieces of Basswood that have the wheel wells drilled out. This kit is designed to fit the wheel base of our Pinewood Racer, 5" center to center.. Using the Fender Kit is best left to kids that have already made a Derby Car or are a bit older. Some cars, like a '57 Chevy, are made by shaping the block and fenders separately, and then gluing them together. Others may opt for a Ferrari and decide to attach the fenders first then design the profile of the car after. Either way, the design possibilities are endless and only limited by your imagination. Happy designing!