Collect & Build Robo-Strike in the Robo-Creatures Series - motorized for exciting mechanical movement! Includes 163 K'NEX parts, primarily rods & connectors. The motor allows for unique and exciting mechanical movement. Robo-Strike stings and walks just like a scorpion! And that's not all - combine all three sets in the Robo-Creatures series to create the ultimate creature! Recommended for builders ages 7+. All sets require 2 "AA" batteries, not included. Features: Build Robo-Strike in the Robo-Creatures series Motorized with 163 K'NEX parts Combine all the sets in the series to create the ultimate creature (each set sold separately) Requires 2 "AA" batteries, not included For ages 7+