... wear. Wear resistance of steel, 50 times.C,Never rust does not change color, and healthy environment. And various acid-base high ... and full-dense material, non-porous.E,Materials, chemical stability, not with any skin reaction. Magnets---magnets,germanium,ray and magnets ... tobacco sub-healthy people, the elderly infirm childB,Pressure of work and study super-friendC,Regular hand, neck, neck, feet, ...