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This is a new kind of key which combines the chians with the keys.There is a special crevice on the circle key so that one key can slide into another through the crevice without an individual key chain.One hand,this kind of design can save the processing material ,on the other hand, different shapes can help the users distinguish which key is it.It makes our life more convenient.
Wang Yanan, Wang Qi, Shi Lei, Wu Jiang