Constructed of silicone and fiberglass, soft, won't wrinkle or fade, nonstick surface, flexible and stretchable. There are 4 adjustable thickness rings for different applications. Versatile Use: This rolling pin and pastry baking mat set can be used to make any mixture you can imagine, like bread, fondant, pizza, cookies, pies, and more, it is an ideal tool and partner for baking and cooking.