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.
Spectrum Noir TriColour Aqua Markers - Essential Neutrals (Pack Of 3)
A pack of three neutral tone Tricolour Aqua markers that blend seamlessly due to the water soluble ink.