Made from .25-inch thick quality acrylic. HQ ruler lines are etched, not printed, to provide long-lasting accuracy when quilting. Use the HQ wave to make spines for feathers, vines, geometrics and other designs. This ruler makes a 8-inch wave from peak to peak and makes either .75-inch or 1.75-inch deep waves. Ruler packaging includes instructions for use, safety tips and design ideas.