Tracing Wheels come in both smooth and serrated versions. I prefer serrated as it transfers the marks better:
Dritz Tracing Wheel - 6'' Plastic Handle
"Dritz Tracing Wheel - Serrated: This Dritz tracing wheel with serrated edge is comfortable to use, and leaves a fine imprint on smooth fabrics that can be pressed away after sewing. * Transfers pattern markings to fabric * Makes dotted markings on most fabrics * Comes 1 in a pack"
