The most famous wood racing event is the Boy Scouts of America 's annual Pinewood Derby which debuted in 1953. Entry is open to Cub Scouts. Entrants are supplied with a kit containing a wooden block out of which to carve the body, four plastic wheels, and four axle nails; or they may purchase their own commercially available kit. Regulations generally limit the car's weight to 5 ounces (141.7 g), width to 2.75 inches (7.0 cm), and length to 7 inches (17.8 cm). The rules permit the cars to be augmented with tungsten carbide weights up to the limit, and graphite axle lubricant.