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A traditional keychain ring is composed of metal coils tightly compelled together.much effort is needed to open it and it is possible to get hurt in the fingernails.
this new design of keychain ring avoids this problem with the metal tip at its opening warped outward,where keys can be slipped in slantly with little effort,saving a lot of trouble for the users.
Yanshan University
Qin Huang Dao, China
Xin Wang,
Yanshan University
Jian Qiao,
Yanshan University
Minchao Cheng,
Yanshan University
Yibo Wang,
Yanshan University
