Permanent or indelible markers are intended for marking that needs to last and not fade or be erased. For example, for drawing on transparencies, for marking on disks, for marking equipment for soldiers and students, and more... Suitable for writing on very smooth materials such as glass and plastic, they are also suitable for writing on wood because the ink is absorbed evenly.
There is a wide variety of permanent markers in different thicknesses and colors depending on the need. In her offices you can find the permanent marker that will meet your needs.