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7° chopsticks are designed to be the tail is solid stainless steel material, the rest are all hollow ,by using the principle of leverage，can make the chopsticks always in the form of 7 ° camber .Thus, 7 ° chopsticks as if there is always an invisible chopsticks holder,whether it is on the desk or accidentally fell to the ground,all have the guarantee of health security.
Ningbo Institute of Technology,Zhejiang University