These blocks are great fun. Each block has something interesting inside it. In our house these have been played with by boys and pretty roughly at times. The windows to see inside are still clear and not one of these blocks have broken. So I would say they are sturdy and hold up well to normal play.
On the ends of each block is a texture. Within each block is something interesting. And many blocks have an activity associated with itpush a button to make a noise, twist a knob to make something turn around etc.
The one thing I would warn is that these blocks do not stack well, particularly in tall towers. So if you are thinking of buying these for tower building, I'd consider a different set of blocks. Otherwise, these are excellent toys.
They provide a basis for communication and vocubulary building with your child. They are sturdy and encourage language, eye hand coordination and so on.
If you enjoy toys that are fairly quiet, do more than have a push button to make a noise, foster independent creative play and exploration of the world this is an excellent toy.
Enjoy.
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My 12 month old triplets have had these for months. They like them. We stack them and knock them down. They fit great in their hands. Sometimes they get very interested on what's inside, lol. I like the entire line they have.
