The MASTERPIECE 660PI CoversAll marker with the patented Flowmaster™ pump-valve and the exchangeable 15 mm Broad-Tip ensures a constant ink flow. The 660PI is filled with CoversAll cocktail ink. A pitch-black, alcohol-based ink which contains synthetic bitumen and provides a permanent, visco-plastic coating (signal black). It is highly opaque, UV- and weather-resistant, fast drying, abrasion resistant and therefore suitable for all indoor- and outdoor-use. Of course, it's refillable very easy with all of our inks and paints. But the best results you´ll get with the alcohol-based CoversAll and Speedflow refill cocktails.