The acupressure needles are made of stainless steel, which can be sterilized within 121F. These needles have been designed to relieve stress, improve your skin texture. they help reduce puffiness and swelling while getting rid of dark spots on the face and hands. These needles are suitable for use by anyone, young or old. Scientifically designed to provide maximum pressure. The needle gives you a great massage, relieving the pain anywhere on your body.