The Pitt Artist Pens provide odorless, permanent, and waterproof inks that won't bleed through paper. These pens contain pigmented India inks that are lightfast, acid-free, and pH Neutral, making them ideal for daily use by artists all over the world. They are perfect for illustrations, fashion design, life drawings, portraits, sequential art, and canvas paintings. These pens effortlessly work on various types of paper and canvas, as well as porous surfaces. Conveniently organized in a wallet, they are perfect for on-the-go artists. You can also purchase them individually or in assorted sets. Be sure to store them horizontally when not in use. Made in Germany.