This POSCA PC-17K Poster Marker contains water-based pigments which can be blended when wet or overlaid when dry. It has a large, 15 mm tip which lets you draw broad lines that can be read from a distance. The ink will come out opaque every time and will not fade over time. The extra-broad, chisel tip measures 15 mm. You can blend the marker when the ink is wet or overlay the colours when dry. The ink is fade-proof and opaque. Each pen has a round, easy to grip barrel. You can use it to mark on paper, metal, glass, wood and plastic. This marker contains black ink. POSCA's XXL-sized tip is a favourite among professionals for successful writing and artists for creating large artworks.