Do you know that the print on a metal or plastic promotional item does scratch off over time? Because normal printing can only print the contents onto the fine surface. Although the ink stays on the surface very well for the first few months, it will come off over time. While laser engraving is a printing method that allow the content etch to the surface. The disadvantage of laser engraving is that only 1 colour is available, and it will be the colour of the base of the metal. The engraved content can stay on the USB Flash drive for a very long period. So when you order some metal thumb drives, we would highly recommend you choose the laser engraving method, not only because of its better print quality, but also it create a much superior professional look than pad printing.