Dont you think that the rubber dots lift the ruler somewhat? I took a class with Sally Collins recently (precision piecing maniac!) and she suggested the little sand paper dots for the rulers. I really like them. The rulers stay right on the fabric. She also recommended something she gets from Home Depot, but I can't remember. Alot cheaper, but since I can't remember, I just get the dots from JoAnns. It was some special sandpaper. Not just ordinary sandpaper.