Writer’s Duos are a set of three colored ink fountain pens that write in beautiful blue, pink and purple. When you flip the pen on the other side the chisel tip highlighters have pastel complimenting colors of yellow, teal and orange. These pen highlighter combos are the perfect go-to for planners, journaling or making your shopping list. And all the OOLY fountain pen refills fit when needed. They are 2 in 1 Fountain pens & highlighters! Clip cap. Works with OOLY fountain pen refills. Suitable for ages 12 and up.