The black ones sold at Walmart were oven liners. I use mine for a pressing sheet. The Super Slider is much better for fmq then the oven liner. It's very slippery and stays in place without tape. I rinse mine off under running water to be sure there is no dust to keep it from sticking to the bed of the machine. I haven't used it on any surface but the extension table so don't know if it will work on a table top.