The Memory Craft 6600 Professional has the speed and precision critical to advanced sewing. The 6600 contains loads of features created especially for quilters, including the AcuFeed system. AcuFeed: Layered Fabric Feeding System ensures your sewing and quilting are even, smooth and precise on all types of fabric. The AcuFeed foot is integrated with a unique seven-point feed dog system, so your fabric is guided perfectly from the top and the bottom. AcuFeed is a unique and innovative feature - once you try it you\'ll wonder how you ever lived without it!