The MASTERPIECE 667PI Speedflow marker with the patented Flowmaster™ pump-valve and the exchangeable 15 mm Broad-Tip guarantees a constant ink flow. The 367PI is filled with alcohol-based Speedflow™ black. The contained, nitrogen-based, black cocktail Speedflow ink has a visco-plastic coating with a light copper shimmer (chemical black). It is highly opaque, UV- and weather-resistant, fast drying, abrasion resistant and suitable for both 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.