Sorry, I have no idea. I found it on a rack in the plumbing department. It's about the size of a masking tape roll, but it's very thick black stuff, with a white teflon layer sandwiched in the roll to keep it from sticking to itself. It came in a bubble pack and was pricey - $10? It's very, very stretchy, and once it touches itself and sits for a minute, it's stuck for good. Someone in the store should be able to point you to it. It's one of those "1001 uses" type of products that you never know where to find...
