Wellnify Bio Magnetic Belts comes with-

Material: Tourmaline Stone and High Elastic Fiber Cloth
Magnets: Four powerful magnets embedded for magnetic therapy
Size: One-size, stretchable elastic for a comfortable fit
Self-Heating: Uses tourmaline and magnets to provide heat without external power
Hypoallergenic: Safe for most skin types, though not recommended for pacemaker users, pregnant women, or infants