Introducing the newest curved piecing tool from Sew Kind of Wonderful Wonder Curve Ruler™ (WCR) Sew Kind of Wonderful This 6" x 10" piecing ruler has colored lines and markings which makes it wonderfully simple to use while making a combination of curved blocks which are used repeatedly in WCR Patterns! Cool WCR feature ~ The three bold colored lines also make it easy to scale a block larger or smaller just by aligning fabric with the different colors and marks.