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The Mighty Hoop 4.25"x13" Embroidery Hoop. The Mighty Hoop is a new magnetic hoop that makes hooping very easy. There is no need to adjust the outer ring as the hoop holds the garment with magnetic force and automatically adjusts for different thicknesses. It also reduces the stress on your wrists and hands because it wants to pull itself together. Even for thick garments, there is very little pressure needed to apply the hoop. Hoop burn is greatly reduced because of the way the hoop holds the fabric. Unlike clamps, Mighty Hoops are designed to work with the HoopMaster for easy accurate hooping. The inside dimension of this hoop is 4 1/4" x 13" (4.25" x 13", or 108mm x 330mm) Actual sewing is approximately 3.5" x 12 1/4" (3.46 x 12.21"or 88mm x 310mm)   (depends on brand of machine) Please select your machine sewing field width from the options below before ordering.