Build the big rigs; Fastback Modeling System lets you build sturdy industrial vehicles, then set it in motion. The powerful pull-back motor propels the car up to 25-feet, without batteries; Includes 50 zoob pieces, pull-back motor, working dumper bin, 4 extra-large rims with monster tires and instructions to build 5 vehicles (or create your own); Includes: For ages 6 years and over. WARNING(S): Only for domestic use.