Product dimension (L*W*H CM): 27.3*11.3*11.8
Inner packs dimension (L*W*H CM): 29.3*13.9*12.4

It is used for “movement and form of energy” teaching. The principle is about a trolley with gravity driving, when the trolley is pushed forward, the object will rise higher and store some gravitational potential energy, and then hands are off, the energy will immediately be released to drive the movement of trolley.