This Dritz brand tracing wheel comes in either smooth (used for softer, delicate fabrics) and the serrated wheel (for heavier, stronger, denser fabrics). Will transfer markings through a double thickness of most fabrics. Use with tracing paper to transfer pattern to fabric or paper for darts, pleats, tucks, pockets, notches and buttonholes. Work on a hard surface and use even pressure and mark on wrong side of fabric only.