... , silver,copper, iron, stannum etc, it ' s a new technology product that you make your own choice ... enduring, no change color, no fall off, withstand a high temperature , and anti-organic solvent scours, it ... tin, zinc, 24k gold, pure silver, etc. with a strong power, high speed, lower stress, and top ... its idiozomes on the surface of metal, which forming a various of bright, gold, red, green, blue ...