Marcellarius, The most common pine wood derby is conducted by the Cub Scouts of America. Boys buy a kit consisting of a block of wood, 4 wheels and 4 nails to act as axles. The build and decorate their car (I believe it has to weigh 5 ounces). On a given day, several cub scout troups get together to race their cars down a track. They are carefully weighed in and then they race in heats. Awards are given for the fastest cars, best paint job, most creative, etc. It is a great way to work with your boy. However, some fathers do all the work and don't let their boy touch it until the race.