Save money on rotary cutting blades when using the 12.5" x 12.5" Clear Ruler. This ruler features our unique patented diamond carbide sharpening edge on one side. This edge sharpens your rotary blades with every cut. It will keep your rotary cutter blade fine tuned and lasting longer too! With a full see-through clear backing and non-skid dots, The Cutting EDGE 12.5" x 12.5" Clear Ruler give you the right amount of stability to confidently cut fabrics without sliding. Our 3 colour marking system offers great flexibility to highlight the most-needed markings. Therefore, visual clutter is reduced while looking for the numbers to use. Great for solid fabrics or patterns!