Made from .25-inch thick quality acrylic. This template set of half circles are easy to grasp and control and are in 1-inch increments (1 1/2″ to 11 1/2″) for quilted circles from 2-inches to 12-inches. Use scored lines to align templates for perfectly quilted circles and arches. Ruler packaging includes instructions for use, safety tips and design ideas. Use with the HQ Ruler Base.