Nice thick blue rubber, but...

I had to squirt the water into it once it was in the fridge because it's so wiggly all the water leaks out. I would think you would have the same problem with baking, that on the way to the oven all the mix would slide to the inside. To use it as an ice cube tray, you would have to put a piece of cardboard underneath. I think the hearts are a little small for baking unless you were making tiny cakes. I'd give it five stars for flexible!

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