French curves with dark marking - Pack of 2 Piece For most home sewing, the fashion curve is used mainly for pattern alterations when fitting, changing or adding new design lines. Choose a fashion curve to make the following four pattern alterations: The professional sewing ruler is made of high-quality transparent plastic, durable and flexible. The scale is precise and clear. Curve Scale: Line detail and clear, high accuracy, is the ideal tool for manual cutting plate making. Silai Curve: Use for necklines, armholes, sleeve caps, collars, and crotch curves. Strategically placed positioning holes help make it easier to use.