That would be my Sewline Fabric Pencil and Eraser that I bought from "Sew Beautiful." It is like using a a mechanical pencil for fabric and includes a little pack of refills which can also be purchased separately in different colors.
The pencil draws a nice crisp line that easy to see. The eraser is handy for when you make a mistake tracing your drawing. The pencil marks wash out in cold water. Remember not to iron over your marks!