The absolute finest quality, permanent artist pen. Smudgeproof and waterproof when dry, the ink contains the highest quality pigments for unsurpassed lightfastness. The brush retains its shape even after constant use. By varying the angle, you can achieve script, fine, medium and broad strokes. This package contains one 5.125 inch long brush pen. Acid free. Archival quality. Conforms to ASTM D 4236. Imported.