magnet core back support far-infrared lumbar support OEM partner elastic and functional fabric magnetic therapy massage belt Tourmaline magnetic support InstructionMaterial:ventilate cotton ,polyester, elastic fiber material, FIR ,special riband fabric and 14 pieces magnets . Health element: Tourmaline magnetSpecialty: 4 in 1: FIR, negative ion, bio-electricity, magnetic therapyTourmaline ...