Embroidery hoops are made of high quality natural bamboo, without burr,smooth and safety to the body Multiple sizes(approx.): 3 inch (8cm), 4 inch (10cm), 5 inch (13cm), 6 inch (15cm), 8 inch (20cm), 9 inch (23cm),10 inch (25cm) and 12 inch (30cm), 8 different sizes to meet your different needs Wooden embroidery hoops have a adjustment screw that you can tighten when necessary to keep the fabric as tight as a drum Multipurpose Use: Not only use as embroidery frames, you can also used for christmas ornaments, room decoration,picture frame, embroidery display frame Cross stitch hoops is really a perfect gift for moms or embroidery lovers