The Mont Marte Signature Acrylic Paint Pens Fine Tip 12pc set features a 1mm fine bullet tip that provides maximum precision for hand lettering, journal detailing, and intricate illustration work. Each pen is loaded with acid-free, water-based paint that flows smoothly and dries to a permanent, waterproof, and UV-resistant finish on both light and dark backgrounds. This mess-free 12-piece palette adheres beautifully to a massive variety of indoor and outdoor surfaces, including canvas, card, rocks, pottery, and plastic.