Acupuncture needles are far different from the hypodermic needle used to give injections. The needles are solid and are inserted into the skin from 1/8 to several inches deep. They are pre-sterilized, individually packaged, disposable needles, absolutely insuring that there is no contamination or transmission of disease possible. They are usually painless upon insertion, but you may feel a slight pricking, numbness, heaviness, or distended sensation in the area around the needle when it is planted. The sensations usually last only a moment.