• The wood is triple glued and smoothly polished, with finished edges. Made of natural hardwood – beech and they are partly hand made. Each hoop features brass hardware and a notched screw for additional tightening. Every hoop bears its famous, wood-burned factory logo! • Different diameters: 4.1 inches (10.5cm), 4.9 inches (12.5cm), 6.1 inches (15.5cm), 7.3 inches (18.5 cm), 8.5 inches (21.5 cm), 9.8 inches (25.0 cm), 10.8 inches (27.5 cm) and 12 inches (30.5cm) with eight different sizes to meet all your needs. The height is 0.31 inches (8 mm) and thickness is 0.39 inches (10 mm). • Easy operation: Embroidery hoops have a brass adjustment screw that you can tighten when necessary to keep the fabric as tight as a drum. This embroidery hoop is light, beautiful and harmless to your hands. This hoop works especially well with finer, more delicate fabrics.