About the tourmaline comb: The comb contains tourmaline powder, can produce negative ion and far infrared to protect hair healthy, cure headache, migraine, and relax brains to cure nerve headache. It is consider as personal care products. Materials: tourmaline Specialty: 1. Store up actinomete 2. Produce constantly 0.06mA microcurrent. 3. Release 8-15um far infrared. 4. Produce negative ion by work on air. 5. Activate cells to provide energy for body. Function: 1. Promote blood circulation of head, relax brains, enhance memory ability, and accelerate energy. 2. Calm down emotions and help sleep good. 3. Improve hair healthy and fight against trichomadesis and white hair.