The Chain Reaction STEM Class Kit develops skills in understanding gravity, force, motion, momentum, speed, properties of materials, the design process and problem solving. This easy to use kit will allow children to set up course of ramp, pendulums, hammers and more to then drop the ball onto the tracks to get it into the goal. After each test run children can adjust the course and learn about cause and effect to get the desired outcome. The set includes challenge cards but the set is also perfect for open ended building to create a variety of different courses. Set includes 6 balls, 10 challenge cards, a guide and 67 durable plastic pieces; including tracks, pendulums, hammers, switches and a goal box.