Quilt Backs Learning Series Card DFT-55 A new addition to the Learning Series Cards features the formula for calculating the quilt back size. Includes information on what to add for long arming and fun options for creating unique pieced backs 16 different diagrams. Includes both standard width fabric and wide back sizing. 4.5" x 6.5" double sided color card, punched for easy display. Save employee time when working with customer questions on calculating quilt back sizes.