Pentalic black illustration pen 5 piece set. The five pen set is perfect for sketching, drawing, illustration, journaling and more. Pigmented, water based ink is acid free, fade proof and water proof. Set includes: 05 0,1.0,3.0,5. And a brush tip. Conforms to ASTM D-4236. Pair this set up with your favorite Pentalic hardbound Sketchbook, traveler journal or illustrator Sketchbook for the perfect urban sketch set.