SAKURA Crayon Marker GHY3-Y 1pc

It's very convenient because it doesn't drop off, you don't need a brush or brush, and you can write upwards.
A crayon type that does not require a cap.
On a smooth surface, you can erase it by rubbing it strongly with a dry cloth.
It is hard to disappear even if it gets wet with rain.
You can check marks on various materials and rub them off.