When you use the Grey Chalk Pastel Colors ZIG Memory System Dual Tip Writer, it appears just like chalk on your projects! This marker by Kuretake has twin tips (0.5mm and 1.2mm) and features a water-based pigment ink. You can easily write on a chalkboard or dark paper and within seconds your writing will appear just like chalk. 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, waterproof, xylene-free, odorless, and lightfast.