Pitt Artist Drawing Pens Wallet Set of 4 Superfine, Fine, Medium & Brush Tip - Sepia, Faber-CastellWallet Set of 4 - Each set includes pens with Superfine (S-0.3mm), Fine (F-0.5mm), Medium (M-0.7mm), and Brush (B) tips all in a reusable plastic pouch. The pigmented ink is both acid-free and archival (PH neutral). Smudge-proof and waterproof when dry. The ink contains the highest quality pigments for unsurpassed lightfastness.Wallet Set of 4 Superfine, Fine, Medium & Brush Tip - SepiaInk is acid-free and archival (PH neutral)Smudge-proof and waterproof when dryUnsurpassed lightfastness