I already have some of these type of non stick silicone baking mats, and I discovered they work good for setting my painted rocks on when I go to brush on the sealant. The rocks don't stick to them where the sealant runs down to the bottom. So I got these ones specifically for that purpose. And they work great. They seem like good quality. And I love that they are three different sizes. I'll probably actually use the biggest one in my oven and the two smaller ones for my rocks. I'm very happy with them and would recommend them.