We have tried: This product is an excellent aid when adding seam tabs to the cut. Suitable also to enlarge different shapes. We draw the cuts or shape on stiffer paper, choose the required width of the bookmark (the widths are indicated on the plastic tool as 3, 5, 7 and 10 mm), place the tool near the cut and simply trace the perimeter of the cut or shape with a pencil. The cut should be made of a stiffer material so that it can be outlined nicely. These tools are an excellent helper not only for seamstresses.