... 3.Tourmaline/Self-heating/Magnetic therapy/Fir heating Magnetic elastic knee support/PadsMain materials: 1 Tourmaline 2 Biological magnet 3 ... blood circulation, activate cells, adjust nerve. Apply for:Bone hyperplasia, knee arthritis, rheumatoid arthritis, joint sprains,contusions,soft tissue damage,congestion ... pregnant women and children are unfavorable to use. Magnetic elastic knee support/Pads