The needles used to stimulate acupuncture points are very slender, barely beyond the thickness of several human hairs. Only the finest quality solid stainless steel, pre-sterilized, single-use, disposable needles are used. Needles are gently inserted just beneath the skin’s surface. It dilates the blood vessels and enhances blood flow to it. The sensation from the needles varies from person to person. You may feel nothing at all, a slight pinch, or perhaps a dull ache or tingle.