I'm not sure exactly what this is called, but it is one of those thingys you put under a rolling office chair to protect the carpet. It's in great shape, heavy and sturdy. Has a zillion little nubs to hold it in place on the carpet. Approximately 55" by 45" Best of all, it is FREE! Email if you are interested. Paul Location: Anchorage it's NOT ok to contact this poster with services or other commercial interests alaska