Pattern utilizes fusible interfacing to make arcs without piecing.
From Quiltsmart.com:
"Close your eyes, take a deep breath, and forget everything you know about piecing a Double Wedding Ring quilt. But rest assured, you will wind up with essentially the same result. You'll get there by a very different path that is faster and far less frustrating. Through the magic of appliqué using fusible interfacing, you'll still get all those curves, but without curved piecing."