BTG HOUSE Magnetic Tourmaline Thermal Self-heating Neck Pad Neck Support Brace Protector Made up of permanent magnets, the bio-composite heat-chip Moxibustion consists of tourmaline,nano-fu Forms a resonant magnetic field resonates with the human bod. Can effectively improve blood circulat Applicable to bone hyperplasia, neck pain, joint pain and other symptoms of hyperthermia therap. Eas Wipe Tourmaline cloth part, and then fasten it to the sor. Safe & comfortable to wear With Velcro closure, easy to take on/ of. Generally 30 minutes later it will work