Product Description Maruyama-style coil Black Eye (patented medical device) has the function of a coil, coated entirely with silicon kneaded with charcoal. It obtained permission for general medical devices in 2012 and is a product that we can confidently introduce. The coil built into Black Eye is based on "Ampere's Law." Ampere's Law is a law that expresses the relationship between current and the magnetic field that forms around it. In Black Eye, the opposing coils overlap to cancel out the same magnetic force. The feel on the skin has also improved. It can be used repeatedly, so please try it repeatedly on areas of concern. ■Product Name: Maruyama-style coil Black Eye General Medical Device Ampere's Law Magnetism Current Free Shipping ■Contents: 6 pieces ■Size: Body Diameter 13mm Thickness 1.6mm ■Weight: 1g ■Material: Copper wire, styrene thermoplastic, elastomer ceramic charcoal ■How to use: ■Manufacturer or Seller: Maruyama-style coil ■Classification: General medical device Medical device notification number: 23B2X00010000001 Patent number No. 4813525 ■Country of Manufacture: Japan It is sold online for 4400 yen. (Photo 14) #Health Goods #Maruyama-style coil #Stiff shoulders