It is a retrofit hair pen with an edge on only one side.

Since the paint is not closed with a border, there is no need to blend in the line art, which saves time.

片側だけにエッジが付いた後付け用髪の毛ペンです。

塗りがフチで閉じられてないため線画を馴染ませる必要がなく時短になります。
