Sign pens refer to pens specially used for signing or signing samples, including water-based and oil-based pens. In the past, fountain pens were used, but now they are gradually replaced by gel pens. Therefore, these pens are collectively called: signature pens.

Water-based signature pens are generally used on paper. If they are used on whiteboards or samples, they can be easily wiped off; oil-based signature pens are generally used for sample signing or other permanent marks. Oil-based signature pens are difficult to wipe, but alcohol can be used. And other things cleaning.