... health care products etc. Specifications: 3~8mm Main Ingredients: Tourmaline, Porcelain clay, High grade clay, others Functions & Features ... , water treatment, spa and environmentally friendlyAdvantages: 1) Tourmaline powder can persistently release negative ions, emit far infrared ... such as sofa, chair pad, bedding, clothing ornament and filter medium 3) After tourmaline negative ion powder is made ...