Grasp the pull buckle by hand to pull the cotton thread. the gear will rotate. the thread rebounds. friving the gear to rotate and drive the race car forward at high speed ..

 the piston rod of the syringe is pushed by hand. Examine how mechanical energy is transmitted when the water pressure is transformed into mechanical power from the water to the loader. Watch how science works when the loader begins to load. ..

make your own hydraulic robotic hand and amaze your friends with its realistic gripping movements..

turning the propeller by hand. you will find that the rubber band also rotates along with it, this is the kinetic energy you release, which is converted into the elastic potential energy of the rubber band. ..

Learn how the motor system works. Assemble a circuit to drive a wooden dinosaur. Learn to explore the basics of mechanics...

Construct a trash bin that can walk across your desk top, floor and wherever you like, use it to help keep your home green and clear, easy to build and no screws are needed ..

 no batteries required!Size 21.5 cm x 16.5 cm x 5.5 cmSuitable for Age 8+ years...

Make your own tank model and amaze your friends with it realistic off  road capability.Item Size 21.5×16.5×5.5cm12pcs..