Janome Narrow Dual Feed Holder Single 9mm The AcuFeed Flex system allows you to sew through many layers of fabric very easily without slipping, or warping the layers. You won't have to worry about anything, even with a full sized quilt project! The beauty of the AcuFeed Flex system is the versatility of the feet. They slide in and out like the snap-on presser feet for the machine giving you more options for all of your stitching.