Build it, bring it to life then tear it apart - with this Erector set, the fun never ends. This set is best suited for an intermediate Erector builder looking for the next challenge. Build over 30 models with this 352-part set, which includes pulleys, wheels, gears and more. A six-volt battery-powered motor is included to make your models come alive. Whether creating a dune buggy, lawn mower, crane, speedboat or motorcycle, this set will incite creativity and logical reasoning while teaching the principles of mechanics and physics. Four AA batteries, not included, required.