Hot Wheels expert track builder system. The Hot Wheels® Track Builder System offers the ultimate track experience for boys by allowing them to design, create and customize their very own track challenges. Using a variety of stunts, layouts and essential pieces that work together or connect to existing sets, boys can be the master of their own track. Rev up the track with this assortment that includes two built-for-speed electronic stunts. It also features a motorized kicker for maximum speed. If you can dream it, you can build it with Track Builder! Not for use with some Hot Wheels® vehicles. Each sold separately, subject to availability. Age from 3 years +.