Non-permanent marker pens are different to permanent marker pens because they are designed to not have permanent ink, you can remove the ink either by wiping or erasing, which is great for creating signs and menus, where you may want to remove the lettering to be able to start fresh.
Edding 151 Non-Permanent Pen
Specially designed non-permanent pens for writing on plastic and glass. Easily removable with a damp cloth.