[sanddrag]

It is part number 60155K113 from McMaster Carr Pictured here and on these wheels here In the first pic toward the bottom right, the part that is the darkest in the picture is approximately 1/8" thick just to give you an idea. This material has a lot of grip on carpet, and does not deform much when force is applied to it (for example standing on it while it is laying on a hard floor, the tread does not "squish" much at all.) It can be cut into any size I suppose with something like an industrial scissors, tin snips, or maybe a band saw. We are not looking to make any money from this deal, just get back close to what we paid. Hopefully someone can help us out. I'll get some pics of our actual extra material tomorrow.