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The design of this pencil is based on the original model the maximum diameter of the tail is longer
than that of the head in order to make room for punching in the tail of the pencil.The hole in the tail is smaller than the maximum diameter of pencil,and its head can be fasten into the hole.You can make a pencil which is about to run out and a new one linked in this way,as a result,we are able to prolong the lifetime of penciland need not use a extender any more.