Made from .25-inch thick quality acrylic. This template set of half circles are easy to grasp and control and are in 1″ increments (1.5″ to 11.5″) for quilted circles from 2″ to 12″. 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.