Creative Grids 12" wave ruler (cgrwave)Spar 50%! This 12" Wave Ruler designed by Judy Niemeyer will add a quick curve to any traditional or paper pieced block measuring 6" or 12" in width and 3" or greater in length. It features easy to read black and white markings and the popular Creative Grids grip. The ruler slides easily over the fabric until pressure is applied; then, our exclusive gripper holds the fabric in place while cutting, eliminating slipping and miss cuts!