POPS are a ring SYSTEM that allow you to make the perfect circles for applique. It takes two APPLIPOPS to make ONE perfect circle. These are custom fabricated for us to the +/- .001 tolerance level of precision which is 5X more accurate than industry standards. The rings are designed as a template-free applique system to be used with quilting weight cotton, not wool or upholstery fabric or silk. They are made by a quilter, for quilters who understand cotton fabrics, weaves, thread count. APPLIPOPS are a precision tool that will always work when used according to directions. And they will work in 90 seconds, freeing you up to get on with the business of quilt making, not quilt preparing! APPLIPOPS rings have been fabricated from the highest grade stainless steel, cut to a +/- .001 tolerance, beveled, and are part of a concentric system of graduated diameter rings from 3/8" up to 2 1/2" in quarter inch increments. They slide in and out of each other and off their hook conveniently, enabling you to only remove the specific rings you need. APPLIPOPS are thinner than a dime, but substantial enough to hold the material. The thinness ensures that you end up with a very flat circle - no thick edges here. The bevel ensures a close fold on the seam allowance side, and the flat side ensures a crisp perfect smooth edge on the applique. The deburring and polishing guarantee a smooth release that won't damage your fabric. APPLIPOPS were painstakingly tested with quilt weight cottons for the perfect fit that holds the fabric "sandwich" just right. The heat from the rings sets the crease, the undiluted starch maintains the shape, and your circle will stay intact until ready to be sewn down by hand or machine. You will be pleased to note that the inner and outer diameters always differ by 1/4" thus enabling you to use the outer ring as a guide to always cut the perfect seam allowance with no measuring or templates ever.