It includes stipule stem, stipule box and stipule. The stipule is in direct contact with the nose and plays the role of supporting and stabilizing the mirror frame. Some cast plastic frames can have no stipule stem and stipule box, and the stipule is connected with the mirror ring.

The connection between the mirror ring and the mirror foot is generally curved.

A pair of glasses frame is usually composed of mirror ring, nose support, pile head, mirror foot and other main parts. In addition to the above parts, there are also foot sleeve, bracket screw, hinge screw, etc.