Rico Plastic Embroidery Rings. With its particularly firm hold, the embroidery ring guarantees unlimited embroidery fun! The ring is grooved on the inside. This means that the inner ring is provided with a narrow thickening all round, which "snaps" into the groove of the outer ring. This gives the embroidery backing a firm hold and prevents it from slipping. Hooping is very easy if the metal screw is completely loosened: simply place the outer ring around the inner ring and then tighten the screw again.