Have you ever wondered the power source of a wind-up car? Where does the clock ticking sound of dad's mechanical watch come from?

The secret lies in the mainspring. Centered on the clockwork there is a spiral torsion spring. We can store the energy by winding it tightly, and then release it to trigger the inner mechanical operation. When the spiral spring is totally untwisted, the operation then stops. The mainspring of this 3-in-1 science kit is the first one in the world made of plastic, instead of metal. Unlike metal springs usually hidden in gearboxes for safety concern, this plastic one is safe enough to be completely exposed even with its highest running speed, giving kids great opportunity to explore the fascinating clockwork mechanism.

This kit can be disassembled and reassembled into 3 styles: car, robot, and timer. Car: wind-up tightly and then release. The car will run at full speed surprisingly up to 14 meters.

Show your friend how fast it can go. Lose a race game? Not a chance! Robot: the spiral spring works with high-speed escapement, providing the robot steady power to walk 50 centimeters. Waddling around with his quirky face, you will find him as the funniest and most hilarious buddy ever! Timer: the spiral spring works with low-speed escapement, performing as a 6 minute countdown timer with ticking sound. Check out when the chocolate cake in oven will be ready, or your favorite TV show is coming up? This helpful device won't let you miss any fun in your life! The innovative science kit is amazingly easy to assemble and more importantly- environmental friendly.

No motor, no battery, even no screw required, the only thing you need is a diagonal cutter to help you build up the entire piece. Explore the secret of clockwork mechanism. First ever spiral spring made of PLASTIC Powered by plastic spiral spring

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