Construct 3 amazing wind-up machines all with 1 amazing set! Try your hand at constructing a robot, a race car, or a countdown timer and learn how these simple machines can run with no batteries or electricity! Here's a hint: these machines are powered by a mainspring - a large spiral spring that stores energy and releases it in the form of motion. Learn all about the mainspring and how to construct these machines in the included booklet. Recommended for 8+
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WARNING: CHOKING HAZARD - Small parts. Not for children under 3 years.