Kuretake Double-Sided Craft Pen - Disappearing Ink Marker + Erasing Ink Brush

Don't bother.

This only leaves the very very faintest of marks - barely noticeable even on white copier paper, so forget about using it for crafts etc since how often do you use white copier paper for papercrafts? And to even make that faint mark takes a fair bit of pressure, which will mark softer papers. Even so it *might* have worked, sort of, except it disappears far too quickly - not days like the description says, but more like seconds! Definitely the worst item I've ever bought from Jetpens, it stands out for how bad it is when everything else is usually great!

A pencil with a thin lead plus a soft eraser will see you through much better than this, no comparison. And if portability is important to you, it will also save you having to cart around one more pen :-)