The 20 Model Erector Set 3V Mtr by Erector is the perfect versatile construction set that will challenge imagination, inspire observation and deductive reasoning. This great set is packed with shiny steel girders, plates, nuts & bolts, wheels and other parts all totaling 261 parts. It also features a 3 Volt motor and gear box for faster and easier construction Everything is included to build a variety of moving creations; a dragster, ditch digger, helicopter, hot rod, lunar module, and more…also includes a great range of eye-catching designs with illustrated instructions. The erector novice will truly love constructing his own motorized work of art! Ages 8+