There is a small hand tool & in quilting catalogs, also & Nancy Z. catalog. JoAnn's also carries it. It is circular and you rub this tool on your cutting mat and it removes ALL the threads and fuzz that is stuck in the cut marks on your mat. You know that you can cut on both sides of your Olfa cutting mat. Somtimes I can cut better w/o the lines on the mat and use my ruler.