The Cutting Edge Frosted Ruler. Keeps you sharp so you never lose your edge. The diamond powder edge maintains the sharpness of your rotary blade as it spins. Full see-through non-skid frosting keeps the ruler from sliding and makes it light enough to see your fabric through it. A unique red grid system highlights the 1/2 inch markings use both lines to square up blocks or to cut squares effortlessly. Large numbers make for easy visibility that never blends into the fabric. Very light 1/8 inch markings do not distract when using the most common 1/4 inch markings. This package contains one 16-1/2 by 16-1/2 inch frosted ruler.