I was at the Midwest Weavers Conference last week and noticed a couple of ladies using these round items to keep their looms from sliding and they really worked! There are about 3" in diameter, 1" thick, seem to come in sets of four and have a non-slip, grippy surface on both the top and bottom. One said she got them at Menards. They seem to go by different names. And that's all I can remember. Does anyone know what I am talking about and can you give me a name or a set of Google search words that might help me find them?