There are VERY few toys that have survived all four of my children—meaning that all four kids loved it and it somehow never broke it or lost it. How often does that happen, mamas?! Almost never. But this toy has been beloved by all four of my babies (and, I admit, for me too) to play around with these cogs, placing them in different ways on the magnetic board and seeing how they fit together. The cogs have cute/silly faces on them, which makes it even more entertaining to look at and play with. Love it! –Linda V.