Bought for my 3yo who enjoys a good puzzles but isnt really up to the ones for age yet so these are perfect. The puzzles measure the same size each so its just the sizes of the pieces that vary. Big pieces for 4pc puzzle and smallest pieces are the 12pc puzzle. Very easy to store in the box it came it because its simple to locate each puzzle due to piece sizes. Theyre made of thick card and not flimsy at all. Great product.