Silicone mat is composed of fiberglass, coated on both sides with non-stick silicone, the rounds mats are great for baking cakes and without the hassle of using parchment paper, these are great simple alternative. They're easy to clean as you just simply wipe them off using hot water and dish soap. Store them by either rolling them up or keeping them flat. They come in a convenience package of two with round sizes of 6 inch, 8 inch, and 10 inch which fits your baking pans.