Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Is this mat with or without fiberglass
Document: I was hoping this would be used without an extra pan required but I do have to use one of my glass pans. It keeps the glass pan clean and nothing sticks to it.
I bake a lot of cookies....I mean a LOT of cookies! These are head and shoulders above parchment paper or Silpat brand mats. They fit a cookie sheet perfectly, go into the dishwasher and clean great, and hold up like a dream. I will never bake without them!
My mother-in-law used one of these when we visited this summer, and I immediately ordered one when we returned home. You can use a tarnished pan without a grimace, and cookies and biscuits lift off the silicone perfectly - no more scratching to get off or falling apart on the spatula. Easy to clean with regular dish soap and water. Nifty! !
My wife likes this very much. She uses it in place of parchment paper based on research saying it would be good for that. It does work perfectly, so we have ordered another one. It is easy to clean, does not burn, is reusable, and store easily. We have now gone about a month without having to use parchment paper, a long term cost savings as well as environmentally beneficial.
I bought this so I could cut it to fit the pan in my toaster oven. Works okay. When I cook a frozen pizza, it does stick around the edges, but at least I can get the pizza off without having foil stuck to the bottom of the pizza now. So, I have to say it works for my purpose. Easily washes off, but tomato based products do stain it. Haven't used it for cookies - might work great for that.
I bought this in preparation of a baking day for my Nephew's birthday, who is in the Navy. His sister likes to make these Heath Bar cookies which always stick to the pans, no matter how well we grease and/or line them. This baking sheet worked really great! It did not stick or stain and was very easy to clean. I plan to get a couple more.Bought a 2nd one for our 2nd annual baking for my Nephew day. We'll never make Heath bar cookies again without them.
My wife says: These silicone mats are the greatest. I used them for baking peanut butter cookies. Without the mats, the cookies stick to the cookie sheets and get too dark around the edges.With the silicone mats - no problems. They come off the mats easily and cleanly. The cookies are baked evenly all round with no dark edges.The silicone mats wash up easily in soapy water between batches or in the dishwasher when all the baking is finished.I would recommend these to everyone. BAKE ON!
The mat is just the right size for me, it lays flat when unrolled, and it is a great product.
This mat fits on a cookie sheet easily, and keeps foods from sticking and staining. It's also easy to wash.
This is mat is perfect for the crafts I've been working on lately. It's easy to clean and it protects the surfaces I work on.
Answer: This is a mat without fiberglass, as far as I know- just a good, regular, silicone mat. I was even able to vut mine into smaller sections. Hope this helps!