My grandson was able to assemble 2 or 3 gears and get the idea immediately, but it will be some time before he is able to follow the instructions to make the suggested models. He likes the fully assembled models which is motivating. We felt the similar kit aimed at 4 year olds would be a bit limiting and not interest him for long. What is important is that he is happy to experiment which should give him an intuitive idea of the basic principles. Appears to be well made, but prologed frequent use might mean that it becomes hard for the pieces to hold together.

Muy buen regalo, excelente para los niños!!!!

Realmente un sistema de engranajes fáciles de manejar para niños desde, tal vez, los 4 años. Son hora de diversión porque te permite hacer varias configuraciones. Lo único es que hay que advertirle a los niños que hay que cuidar las ligas y las piezas siempre bien guardadas, porque imagino que si se pierde o se rompe alguna, sería un poco dificil encontrar las ligas de ese tamaño, las piezas se ven resistentes, en general.Lo recomiendo totalmente

A good learning tool - use and learning will grow with the child.

Ai miei bambini di 5 e 7 anni è piaciuto molto. Facile da montare, devono fare un po' di forza su alcuni pezzi ma ce la fanno. Robusto, buona qualità. Gli ingranaggi girano bene e la macchina costruita funziona e resiste bene, ed è di grande effetto.