... of testing report from National product quality & control bureau: NPQC No.3. 200150013, as well as via of testing report from the ... engraving area, can engraving whatever plane or bend surface, No noise, No smell, No dust, and you can use it anywhere. It suit ... with the laser engraving product, besides, with clearly, enduring, no change color, no fall off, withstand a high temperature , and anti-organic ...