Build Dinosaurs that roar and stomp! The K'NEX Dinosaurs 20 Model Building Set is packed with 326 parts to build a T-Rex, Brontosaurus, Pterodactyl and more. Then bring them to life with the motion-activated sound brick! Instructions and building ideas are included for over 20 different dinosaur models, ranging from beginner to more challenging. Or, use your imagination and create your own dinosaur! All the parts are packed into a handy storage container for easy clean-up and portability. Standard K'NEX parts made in the U.S.A. Special components made in China. Packaged in the U.S.A.