1. Unique modeling, personalized and versatile 2. Exquisite workmanship, healthy and harmless material 3. Smooth grinding, comfortable to wear, does not hurt the skin 4. Not easy to lose color / deformation, durable 5. Material: stainless steel, natural stone, black gallstone 6. Processing technology: polishing 7. Chain length: about 20cm 8. Weight: about 11g