Material: bamboo, metal,Size: diameter 13cm / 5 in,suitable for teaching children Cost-efficient: 16 pieces embroidery hoop in one pack, Small Bulk Wholesale. Easy to use: embroidery hoops have a brass adjustment screw that you can tighten if necessary to keep the fabric as tight as a drum. Decorative,natural bamboo material,with your embroidery works,can be hanging,erected on the wall,table,bookcase decoration on the role. Multi-purpose use: not only for embroidery, crafts and quilting, you can also use wall decoration, wedding decoration, garlands and small ornaments.