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Ceramic type stone. They work good in my RV gas stove to even the heat out.
As you have noticed, they do not specifically state a max temp. Baked products such as pizza, bread, or pastries typically have a baking range between 400 and 600 degrees F. In fact, the instructions with the stones stated to first preheat to 500 degrees F. These pizza stones also claim to have ThermaBond - reputedly extremely durable and not prone to crack from thermal shock. I don't know what else to tell you, but they have worked for my intended purposes.
Each stone measures seven and a half inch by seven and a half inch by three eights inch. They are light, easy to clean, and I can make small or large pizzas, bread, or pastries on the stones.