The Nine Needles are different in name and shape. The first one is called Chanzhen (sagittate needle) ? 1.6 Cun in length; the second one is called Yuanzhen (round — pointed nee¬dle), L 6 Cun in length; the third one is called Dizhen (arrow - shaped needle)，3. 5 Cun in length; the fourth one is called Fengzhen (sharp needle)9 1. 6 Cun in length; the fifth one is called Pizhen (sword 一 shaped needle)，4 Cun in length and 0. 2 Cun in width; the sixth one is called Yuanlizhen (round - sharp needle)，L 6 Cun in length; the seventh one is called Haozhen (filiform needle)，3、6 Cun in length; the eighth one is called Changzhen (long needle), 7 Cun in length; and the ninth one is called Dazhen (large needle)，4 Cun in length. The Chanzhen， marked by large head and sharp tip，can be used to reduce Yangqi; the Yuanzhen，ovoid - shaped，can be used to press muscular interstices to reduce Qi ⑷ without damaging the muscles; the Dizhen, as sharp as minute millet，can be used to press the Channels to promote the flow of Qi without penetrating into the skin; the Fengzhen, triple - bladed，can be used to treat obstinate diseases; the Pizhen, as sharp as a sword, can be used to remove pus; the Yuanlizhen，like a piece of long hair which is round - sharp and thick in the middle part，can be used to treat acute diseases; the Haozhen, as sharp as the mouth of a mosquito, can be used to treat pain and Bi - Syndrome by light insertion, mild thrust and lift and long retention [of the needle for the purpose of] invigorating [Zhengqi (Healthy - Qi) ]; the Changzhen, sharp and thin， can be used to treat chronic Bi - Syndrome; the Dazhen, like a stick, slightly sharp and round，can be used to reduce retention of fluid in the joints. This is a general description of the Nine Needles. ’’