Modern acupuncture needles are stainless steel, between one-half and three inches long, ultra fine and quite flexible. They are pre-sterilized; nontoxic and disposable (single use). When the needles are tapped into the skin, there may not be a sensation. Much depends on the location (hands and feet tend to be more sensitive), the condition being treated and the acupuncturist’s technique. Needles are typically placed in several acu-points and are usually left in about 20-40 minutes. The goal is to normalize the circulation of Qi and blood by stimulating the energy points, which encourages the body’s natural healing process. Stimulation can be done by rotating the needles manually or attaching electrodes to send a weak electric current through the needles (electroacupuncture).