Can you provide a picture? I'm completely unable to picture this in my head.
They are called plastic canvas sheets. Like these: http://www.amazon.com/gp/aw/d/B00DV...vas+sheets&dpPl=1&dpID=51VtsKHD1gL&ref=plSrch
Can find em at any store that sells sewing supplies. =) I also use them in my hobs as another layer of filtration, holds down my polyfiler.
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