1,NATURAL MATERIAL: Black Sibin Bian stone,Crafted with traditional handicrafts. Well smooth edges,skin-friendly and comfortable feeling on skin. 2,BEAUTY FUNCTION: Anti aging skin care,relieve facuak wrinkles,face muscle relaxing,sculpted skin with a radiant glow,reducing under-eye circles and puffiness. 3,MASSAGE FUNCTION: Relieve pain and relieve muscle spasm,removing dampness etc. Bring you comfortable and relaxing experience. 4,WIDELY APPLICATION: Massage for head,face,neck,shoulders,body,limp etc. Soothes nerves and releases stress. For household use. 5,Easy to put in pocket or backpack. A healthy gifts for friends,family and yourself. Some natural rock texture on surfaces,it is normal.The bian stones are fragile,use with care. Precious natural Sibin black bian stone advantage: 1,No harmful substances by testing. 2,Contains more than 40 kinds of trace elements necessary for human body, such as calcium, magnesium, zinc, chromium, strontium, selenium and other anti-aging elements. 3,Microcrystalline stone, similar to metallic crystals. And texture is very delicate, massage the body makes you feel very comfortable. 4,Use of non-invasive mild stimulation, mobilize the body's own defense ability, harmonize the vital energy,blood and viscera function.The effect is far more than other materials (such as wood, metal, jade etc). 5,Acupoint massage as green natural therapy, and via this way can help to diminish stress and fatigue,better to relax the whole body. For sub-healthy and mentally stressed people, it can eliminate tension, anxiety, relieve fatigue, and make the brain gain sufficient energy.