The OmniArc non-slip circle cutter ruler has handy grooves and easy-to-read angle markings for cutting circles with a finished diameter of 4", 6", 8" 10" or 12". Use it for quilting, sewing and crafts - any DIY project requiring circles. Use with a rotary cutter or a straight-edge blade. Patented non-slip backing to hold ruler in place during cutting. Edge markings for accurate measuring and laser cut edges for smooth, deep cutting. Patented double-sight lines that show up on light and dark fabrics. Heavy-duty durable acrylic material.