(1) Ellipse shape (ovoid olivary oval shaped), more comfortable. With Brass Lock Joints, more convenient. This is a restraint system that is both high-function and high-fashion. Made from strong, cold, heavy steel allowing long use and wear. Our blacksmith custom makes this item by hand.It has one O-rings for attachment to chains, ties or other bondage gear. Means you can securely lock your sub to the toys of your choice.The inside diameter is 4.7*5.7 cm, the width is 3.0 cm.(2) The weight of this item is approximately 330g.