These are oven liners, not baking mats. Baking mats are just thin silicone hot pads, I have one beside my stove to sit hot things on. The oven liners are very thin sheets, not much thicker than paper and work very well for FM quilting. I get them at a dollar store and get 2 out of 1 sheet, costs about $5 for 2. Have used them for years, they last a long time as long as you don't sew through them.