The Staedtler Triplus Fineliner pens are slim and lightweight, with a 0.3 mm superfine, metal-clad tip. Their ergonomic, triangular-shaped barrel is great for fatigue-free writing and drawing. The Triplus Fineliners have a dry-safe feature that allows several days of cap-off time without ink drying out, and the ink is acid-free. Available in multiple ink colors.