I own an aluminum pizza baking plate. Actually 2 of them. Both perfectly smooth. thick, non-warping cast aluminum made out of Mig 6 alloy. I think one is about 6 mm thick and the other about 10 mm. but maybe it’s 12. It (Mig 6) has a lower thermal conduction than some other aluminums, which is good, because you can get a plate that conducts heat too fast The thing I sort of dislike it that the temperature is harder to read with an IR thermometer because of the shiny bright surface. These are reasonably cheap on Ebay.
