Alkaline Ceramic Balls 1) Size: dia. 2 - 15mm (as your request) 2) Color: black 3) Main ingredients: tourmaline Alkaline Ceramic Balls Features:1) Tourmaline powder can persistently release negative ions, emit far infrared ray.Hence, it can purify air, accelerate the micro-circulation of the body, resist bacterium and diminish inflammation, resist fatigue,2) Remaking into various environmental ...