How big are the needles and how deep are they inserted?
The stainless steel needles, normally about as thin as a human hair, are pre sterilized and disposable. Unlike the hollow needles used for giving injections, acupuncture needles are solid. The acupuncturist will insert them to a depth of anywhere from a quarter of an inch to 3 inches, depending on the amount of subcutaneous fat that the needles need to penetrate.
