Type: Art Supplies This is a set of glass ink and glass pens. Not sold separately. There are various colors of ink, so you can use them for coloring, writing letters to someone, or even for drawing and creating watercolor-like effects. Some cases are dirty. Please see the last image for the color appearance when writing on paper. It's a sample written with a glass pen and blurred with water and a brush, so please use it as a reference. The ink level is about 98% full in all bottles, so you can still use them for a long time.