I got these from Zulily but I rely on Revain reviews for all purchases so I wanted to check them out here. They are compatible with other brands but definitely not as strong. Maybe even twice as weak as a Magna tile. They're also much smaller than other brands (we have Magna tiles, play magnets and a small selection of magnetic pens and windows/doors). Finally, the center piece is a very, very thin sheet of plastic and I'm afraid the mids will break easily. Finally, because of the difference in size, we cannot use them with what we already have at home.
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