Build Ace - motorized for exciting mechanical movement! This set comes with 122 K'NEX parts, primarily micro rods & connectors to build a motorized robot. And just as his name suggests, Ace moves by creeping along on four legs! Recommended for builders ages 7+. Requires 2 "AA" batteries, not included. Standard K'NEX parts made in the U.S.A. Special components made in China. Packaged in the U.S.A.