This pigmented drawing ink is extremely lightfast and waterproof. Pitt long lasting pens are convenient to use and all are pH neutral and acid free. Unique brush point ensures an even flow of ink, gliding gently and smoothly over the paper while retaining its shape even after constant use. By varying the angle, you can achieve a personal touch to your script or lines—fine, medium and broad strokes, as well as shading of various kinds. Available individually or in sets.