The Mighty Hoop is a strong magnetic hoop, which can be used on almost any embroidery machine. There is no need to adjust the outer ring of the hoop, because it holds the garment with magnetic force, and automatically adjusts for different thicknesses. Mighty Hoops reduce hoop burn, and stress on arms and wrists. Mighty Hoops are designed to work with the HoopMaster for easy accurate hooping. You can hoop the impossible with Mighty Hoops!