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They're magnets and they function as such and my 20mo enjoys playing with them. My only problem is that the colours don't look the same as in the picture. The colours are all darker especially the green and the purple is more of a pink, I wish they were as vibrant as the picture.
Ive bought this product several times and think it's pretty great but the magnets inside the plastic casing usually end up out after a few months of use as because the shape looks like a hammer to 3-4 year old kids so they smack them on the table and against the other ones and eventually break the plastic and the magnets fall out. If you hoover over the kids maybe they'd last longer but whose going to do that? Probably safer for school age kids.