The absolute finest quality, permanent artist pen. Reliable and even flow of ink; point glides softly and smoothly over the paper. Smudgeproof and waterproof when dry, the ink contains the highest quality pigments for unsurpassed lightfastness. This 1.75x5.75x.625 inch package contains four pens with four nibs (S, F, M, B). Acid free. Conforms to ASTM D 4236. Imported.