Modern commonly used needles can be roughly divided into three kinds: millineed needles, the length of 5 minutes to 3 inches and 5 minutes ranging from several kinds of thickness also have 26, 28, 30, etc., respectively, the body of the needles rounded and smooth, made of a variety of metal wires, generally made of stainless steel wire. This is one of the most widely used needles; three-pronged needle, the body is triangular, three sides of the blade, thickness and length are also different, mostly used for real heat disease, shallow stabbing bloodletting to diarrhea blood heat; skin needles, also known as "pediatric needles", is made with five or seven small needles embedded in one end of the handle, such as a rosette-like needle made (loaded with five is called) "Plum Blossom Needle", seven known as "Seven Star Needle"), mostly used for fear of pain in women, young children, gently knocking, safe and effective.