Design the car body from wood. Kit includes a wood block (1-1/4 x 1-3/4 x 7 in.) with two 1/16 x 1/8 in. deep axle grooves already cut. Also includes Speed Axles and KELVIN® High Speed Wheels for faster speeds. Can be used with the KELVIN® 2- or 4-lane Downhill Racing Track. Ideal for middle school grades.