The guy who sees from the back of the glasses. It is the broach which laser-cuts the pure material of maple. I used a pottery brooch design. It is very lightweight because it is wood. Please enjoy the smoky smell together. The back side uses a rotation pin made in Japan. It is safe because it takes a lock. size Approximately 3.8 × 1.8 cm Material Wood (Maple), metal fittings Wood is a natural thing. Therefore, there is a slight difference, such as grain and color. The thin part is delicate. Please be careful not to drop or apply strong force.