There is no need to adjust the outer ring of the hoop, because Poolin Embroidery Magnetic Hoops hold the garment with magnetic force, and automatically adjusts for different thicknesses. There are 8 magnetic embroidery hoops with different sizes and shapes, which can meet your different embroidery design needs. Poolin embroidery machine magnetic hoops are made of metal which makes it more durable. It is suitable for our Mirror and Vision series and also other commercial embroidery machines. It also can reduce your costs and stress. Magnetic hoops reduce hoop burn to reduce the number of hoop replacements which can save money and release stress on arms and wrists.