This is a great set for a little constructor. My 3.5 years old son loves constructing complex stuff with toys therefore to encourage him we have purchased many sets for him (legos, mega blocks, thistle blocks, quercetti tubes) Each offer different fun but this one stands out being the most mobile one.It comes with 95 hard plastic pieces, some are to construct the base plate while another group is to carry the fun to the third dimension (the upright sticks) The rest of the pieces are colorful interdenting gears. Finally it has two handle bits which you need to move the gears round and round.You can put the gears and sticks in various combinations (gears on the side of sticks or sticks on top of gears or gears on top of each other etc.)After some trial and error experience with me (my son and I) we figured out the way they should be aligned to transfer a horizontal rotation to a vertical one. Then my son took over and started building interesting combinations. I am sure he will master it in time.My experience is that the parts are a little stiff which is good for non wobbling steady rotation but bad for the little one to stick them together. So younger children may need some help from the parents.The price ($30) is good considering the number of pieces. Each piece comes to around 30 cents which is lower than many other construction toys. (better than quercetti and lego duplos but slightliy worse than mega blocks.) Besides the storage can is a real good advantage to store it properly after play time.This toy set offers good fun for the little one and helps develop his/her fine motor skills as well as supporting the imagination. Yet it might be difficult to operate or master for younger children. I recommend it to anyone who is after a good toy set at a decent price...