Learn engineering concepts like structures, mechanisms, physics, and more using high quality TechCards, axles, wheels, and pulleys. The 12 projects you will be learning how to build include the Air Powered Dragster, Cam Powered Boat, the Rubberband Dragster, Balance Scales, Mechanical Hammer, Scissor Lift, Draw Bridge, Lever Hoist, Lever Crane, Spiral Toy, Marble Run, and the Mechanical Puppet.