Create amazing works of art on your chalkboard with the Blue Chalk Pastel Colors ZIG Memory System Dual Tip Writer Marker by Kuretake. This marker has twin tips (0.5mm and 1.2mm) and features a water-based pigment ink. Try using this marker on dark paper or chalkboard; the ink magically appears! You can also blend this marker with the ZIG Memory System Calligraphy markers, sold separately. Included is one marker that is archival-quality, acid-free, lightfast, xylene-free, waterproof, and odorless.