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Having both Lily Lines rulers gives you the flexibility of seven gentle curves, all with fine measurement gradations along all edges, a laser etched 1/4″ echo line, and pinhole alignment lines. You are limited only by your imagination in creating beautiful curving frames, radiating curving foundation quilting, or perfect ruled spines for feathers. Made of 1/4″ thick, compressed light-emitting acrylic. It is a translucent pale, pale green that reads as clear from above, but glows a beautiful aquamarine from the edges if viewed at an angle. Measuring 10.5″ x 3-4″, they are just the right size, ideal for making easy, graceful frames, especially behind appliqué. All edges feature finely inscribed registration lines for precision placement time and time again. Simply match a ruler line with a registration point directly on the quilt for easy, repeating perfect curving lines.