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Safe pin is designed in order to protect people from being hurt by pinpoints. It is composed of three parts: a pin, a protecting cap with a tiny hole in the middle, and a spring connected between them. In normal status, the spring keeps the pinpoint inside the protecting cap, prevent people from getting stabbed by the cusp. When we need to use the pin, just compress the spring a bit to expose the pinpoint throughout the hole. Once the pin is drawn out from the wall, the spring expands and the pin comes back to normal again.
Zhou Leijing, Shan Huabiao, Zhengcheng, Shi Yan, Zhang Fan, Zhang Yu, Qin Duyin, Jia Pengxiang, Shuai Yinbin, Wang Guanyun, Wei Chengyuan