ATTENTION. Not suitable for children under three years of age. Small parts. Risk of suffocation. Long cord. Danger of strangulation. playfully understand the effect of forces build and understand the same pulley blocksTricks learn excellently with "spiel gut"Simply lift heavy things: with the pulley block this is no problem. Everybody knows the pulley block, but only a few know how such a pulley block really works. With this experiment box you can design and try out different pulleys in the game. With power games and other tricks you can easily understand what a few pulleys and ropes can do. Because it doesn't matter how much power you have, but how skillfully you use it. Experimental kit from 10 years on, with "spiel gut" excellent.