FABER-CASTELL-Pitt Artist Pen: Brush Set. These artist pens are extremely fade resistant and feature waterproof pigmented acid free India ink. Ideal for drawing lettering fashion sketches and illustrations of all kinds. This package contains twelve Brush pens in assorted colors. These pens come in a handy slid-out storage case (6x6x7/8 inches). Conforms to ASTM D4236. Imported.