It looks like and is shaped like half round moulding used in wood working or for baseboards. Check the local hardware stores or big box stores like Lowes or Home Depot and you can probably get 6 to 10 feet or more of it for a few dollars. They will also cut it down for you, free of charge. I think it also comes in different round sizes. For comparison, Nancys Notions is selling 16 inches for 13.99.