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The weakness of the traditional key-ring: it's difficult to open.
The new key-ring is improved based on the original design. Bend one endpoint of key-ring to align to the other endpoint. We can easily open the key-ring with squeezing the dislocation. Due to the flexible of metal, the key-ring can return to original state after releasing finger.
Shixiao Li Xin Jin Chao Ren He Sui