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These are the same thing as the cordierite kiln shelves sold by many pottery suppliers around the world. The only difference is that CPS marks up the stone about 75%.
If you decide on going with a cordierite stone (it really depends on what your oven can do and your target pizza style), then you're better off going with a place like Axner (google it) or, better yet, finding a local pottery supplier so you can avoid shipping.
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