We bought molding strips in the flooring section at Home Depot. They are flat on bottom but angle up to the top which is rounded. We found them in maple and red oak...long strips like about 90"' I believe the oak was a little cheaper than the maple. Wanted to find half round molding trim strips as I believe the "store bought" ones were made of but couldn't find them anywhere. Anyway the ones I am making look and work great. Good luck if you try to make this very useful gadget!