I have two of the best cookie sheets you will ever find. If you can find them , that is ! I got these in Sydney , but have bever seen them again since. I would really like a few more.
They are "mermaid" brand and made in England. Very heavy gauge anodised alluminium.Angled lip on one edge and no lip on the other edges. They certainly don't warp or even budge and they are the type of product that you could hand down from generation to generation.