Feature: Our necklaces have black hematite stone magnets, Experience relief from pain, stiffness and tension in the neck, shoulder and upper back areas. For years, magnetic therapy has been used to naturally treat and stop migraines. ALSO: Effective to relieve chronic spinal pain from degenerative and bulging discs. Can also promote bone growth of fused discs after cervical fusion surgery. 100% Hypoallergenic. Guaranteed to be Lead & Nickel free; No more allergic reactions! Handcrafted for high quality; Strong Clasp that stays put. Specification: Material: Hematite Stone Color:Black Size: Length 43CM/17" Pendant Size:3.5x 2.1cm/1.4"x 0.83" More detailed,please see photo, Quantity:1 Pc. Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included: 1x Necklace.