The pinewoo derby is a racing event for Cub Scouts in the Boy Scouts of America. Cub Scouts, with the help of parents, build their own cars from wood, usually from kits containing a block of pine, plastic wheels and metal axles. With the popularity of the pinewood derby, other organizations have developed similar events and a small industry has developed to provide tracks, timers, scales and other products. The pinewood derby was selected as part of "America's 100 Best" in 2006 as "a celebrated rite of spring" by Reader's Digest. Similar Cub Scouting events include the raingutter regatta with boats and the space derby using rubber band powered rockets.