Kinetic energy is energy in motion, and these machines are just that! Thames and Kosmos’ Kinetic Machines are build-it-yourself physics fun in all sorts of shapes and sizes. You can build a desert racer, a catapult, a balancing dragon fly, or a launchable motorcycle, all while having a blast and learning about physics. Box contains 108 pieces for 5 models, and 24 pages of manual. Imported. Ages 8 and up. Choking hazard, keep away from children under 3 years.