It comes with 100 rings, which are designed ideally for this purpose. They definitely will not snag your square. The apply very light pressure, so they may leave an impression but it will smooth out in a few minutes. You should not yank on the square, but rather press on the clip which will open the clamp. It is very easy to use; a child could do it. I hang all my personal squares (which I call the "Private Reserve") on it and stand behind this product -- I would not sell it otherwise.