Pitt Artist Pen® in black: this pack of four (4) pens includes the following nibs: S, F, M, and B. Pitt Artist Pens by Faber-Castell offer odorless, permanent and waterproof India inks that will not bleed through paper. The pigmented India inks are lightfast, acid-free and pH Neutral. The pens are used daily by artists worldwide for illustrations, fashion design, life drawings, portraits, sequential art and canvas paintings. They work beautifully on all types of papers and canvas, permanent on porous surfaces. Ideal for sketches and studies in ink. Convenient wallet provides storage for "on the go" artists. Store horizontally when not in use.