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Condylus is a pushpin with an orifice paralleled with its pin. The incurvated sides of Condylus handle will help you to join its pin to others orifice, no matter which side you chose.
The cross section of Condylus handle is elliptically. It will prevent these little busters rolling everywhere.
The elliptoid shape means that users can push them in or pull them out with a little strength. It is especially helpful for female, children and elderly.
Zhao Wei, Man Jinfan, Chen Jingchang, Ye Milan, Zhu Pengcheng, Yao Lining, Shi Yan, Hu Yichuan