Most people are surprised and relieved to learn that acupuncture needles are very thin—unlike hypodermic needles which are thick and hollow. Acupuncturists can attain a high level of skill in gently placing these tiny needles and often the insertion is barely perceptible. The needles are usually inserted only several millimeters in depth—also very unlike hypodermic injections. As such, patients generally do not feel the painful piercing or pricking sensation typically associated with an injection, blood sample, or other medical needle procedure. Only single application disposable needles are used.