From Sew Kind of Wonderful, this QCR Mini© is recommended for use in their Mini Wonderful Curves book. Use the QCR (Quick Curve Ruler) to cut curves easily and reduce curved cutting and sewing time. You can also use it as a square-up ruler. The compact 5 in. by 8 in. size makes this handy to pack for a quilt class or retreat. A free Mini Runner pattern (see photo inset) is included in your package, and multiple QR Mini ruler patterns are available.