Quality material: Made of stainless steel, which is not easy to be damaged, and very wear-resistant, so that they can be used for a long period of time, giving you a pleasant feeling of use. Suitable size: The stainless steel probe is 2mm and 5mm, with an elaborate small sensing head, which can position the sensitive acupoint more accurately. Humanized design: Double-headed design, both ends are very smooth and do no harm to your skin, there are anti-slip strips on the pen holder, which will not slip due to your hands sweating. Easy and safe to use: Simple pressure or sliding, it will not hurt the skin during the massage. Lightweight and compact, suitable for home and travel use. Muscle relaxation: Massage trigger points deeply to relieve muscle knots and pain in back, neck, shoulders and other parts, relax muscles. Ergonomically designed, easy to hold and use, easy to use, suitable for all people and athletes with muscle pain and fatigue.