This circle is a 1/4" template used to guide a longarm machine to stitch smooth curves. It will stitch a 3" circle on machines with 1/4" hopping foot allowance. The light blue color helps make the etched lines easy to see on any fabric. It has curved etched lines to help with placement to stitch curved crosshatching. It has straight etched lines 1/4" spacing to help with placement. It has etched lines to mark the 4 quarters. All of these lines are useful in quilting various designs.