The Basic Car Kits include a wood block, wheels and axles, and complete instructions. Ideal for those who want to create their own unique designs. Economically priced. Wheels and axles should be the same on all cars in a race. Official BSA wheels will fit cars. Pinecar Wedge Car Kit #369 Pinecar Basic Car Kit #370 32 YEARS OF GREAT LOW HOBBY PRICES If You Have Questions, Please Call Toll Free, 1-800-225-6509 Ask for Doug