Stomp, Chomp, Stomp, Chomp - Watch these creatures come ALIVE with new Beasts Alive Building Sets from K'NEX! Use the 200+ classic K'NEX parts to build, Tri-Stego, a stampeding dinosaur. Once built, turn on the motor and watch it come ALIVE right before your eyes! The set includes two additional building ideas that can be built one at a time. All K'NEX rods and connectors are made in the USA. Perfect building experience for kids ages 7+. Requires 2 "AA" batteries, not included.