The Jillily Studio Duet Foundation Ruler by Jill Finley was designed to make foundation paper piecing easy and much faster because you are not stitching through the paper, eliminating the need to remove it from the stitches. Once all the pieces are added and sewn together, the printed foundation can be removed in one piece and used again. Jill has been teaching this method for over a year and quilters love it! Ruler size is 3" x 8".