Spring tension hoops are easy to use! Eliminate tightening screws that distort your embroidery, stitchery, applique or quilt fabric. Just lay fabric over the outer plastic hoop then gently squeeze the inner metal hoop to secure it. This package contains one 3.5 inch hoop, one 5 inch hoop and one 7 inch hoop in assorted colors. Hoop thickness: 5.5mm. Imported.