Get the Dritz Ergonomic Serrated Tracing Wheel for a comfortable sewing experience. The package includes one ergonomic tracing wheel that is designed to eliminate stress and strain on your hands and wrists. Its gently curved handles follow the natural form of the hand and make it easy for you to transfer markings (like pleats, darts and buttonholes) from patterns onto fabric and to make slotted perforations. This tracing wheel is especially great for those with arthritis or carpal tunnel syndrome.