Ink Type: Water based pigment ink. The ink is acid free, archival, and water resistant.Tip Style: .5mm roller ball tip.Ideal Uses: Great for planners, daily writing, and journals. SARASA Clip features water-based pigment ink that is acid free and water resistant for a long-lasting impression. Perfect for journaling, note taking, and studying, the SARASA Clip will help you stay organized with the wide variety of colors.Features an alligator clip to allow for security on artwork, notebooks, clipboards, etc.Available in a variety of vibrant standard ink colors with a 0.5mm pointComes in a convenient reusable storage caseAP Approved Non-toxic