This 12in Wave Ruler designed by Judy and Judel Niemeyer will add a quick curve to any traditional or paper-pieced block measuring 6in or 12in in width and 3-1/2in or greater in length. Compatible with the Quiltworx Charm Elements, it will create a variety of layout options! 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! Total Size - 2-1/2in x 12-1/2in Creative Grids® products are made in the USA and sold in independent quilt shops only.