Color: black. – Material: Tourmaline, nylon, spandex. – Size: About 30 x 6cm. or 11.81 inches x 2.362 inches – Made up of permanent magnets, the bio-composite heat-chip. – Nano-functional ceramic powder and a special heat sensitive materials. – With dual thermoelectric and piezoelectric effect. – Forms a resonant magnetic field resonates with the human body. – Can effectively improve blood circulation, promote metabolism, and clear the meridians, enhance immunity. – Applicable to bone hyperplasia, wrist pain, joint pain and other symptoms of hyperthermia therapy. – With elastic belt, safe & comfortable to wear. Includes 1 pair.