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I bought this twice on the off chance the first one was faulty. However, both packages turned out the same: completely squashed and out of shape with no hard shell to hold them in shape when pouring in your medium. I use jesmonite which is a fairly heavy, concrete-like material, and without the hard shell that should come with these moulds, it will not securely hold its shape. Very disappointing and quite pointless really. Returned them sadly.