Colantotte Magnetic Necklace Crest Premium Color Necklace Limited Edition Gift Set (Premium Black, L) with Gift Wrapping

Available sizes: S (43cm), M (47cm), L (51cm) Colors: Premium Gold, Premium Black, Premium Silver Materials: [Body] Silicone; [Joint] Stainless Steel (SUS316L); Magnets: Eight rare-earth permanent magnets, 160mT (1600G), arranged in alternating north-south poles Medical Device Certification Number: 226AGBZX00054000. Improves blood circulation in the neck and shoulders and relieves stiffness. Waterproof and washable, it's also ideal for sports.