These are ideal pens for drawing, illustrating, doodling and suitable for technical and artistic work. The unique Sakura Pigma ink will not bleed through paper and is indelible and lightfast, the ink will dry to a natural PH. Pack contains 6 fineliners and 1 brush pen, 005, 01, 02, 03, 05, 08 and the brush pen will give various width. All pens are black ink with an archival quality that is waterproof, fade and chemical resistant and will not smear or feather when dry. Bullet Journaling and Calligraphy are a popular use for these pens.