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Pushpin everywhere in our daily life, buttraditional pushpin has a lot of problems.it is not easy to be pulled , every time.it is not easy to be pulled , every time,only nailed a piece of paper, it easy to cause the paper damaged.Thumb Tack adopting spiral modelling.Like this easy to pull out, And at the same time can clip many pieces of paper . wont cause paper damaged.Pushpin use TPR qualitative. it has strong elasticity.Easy controled.
Liu Jia , Zhang Xin, Dou Jing