The Brother PRMS360 PR Hoopnetic Magnetic Sash Frame is a rectangular-shaped hoop made of metal. It is compatible with Brother embroidery machines and has a large size. The hoop uses magnetic technology to hold the fabric in place, making it easier to embroider. The product is called Hoopnetic because it has a net-like structure that allows the hoop to move freely while the fabric stays in place. The sash frame is designed to hold long and narrow fabrics, such as sashes or ribbons.