The Hera marker is an ingenious little plastic marker that makes a shiny line on fabric, perfect for marking hand quilting lines that needs no removal. Technically this is called a “tracing spatula.” The shine on the line on the fabric is caused by the friction of the edge of the tool on the fabric fibers, and it makes a small crease in the fabric as well. The shine and crease will be covered by stitches or will be smoothed out when the item is washed, leaving no trace.