Pump-action, fiber tip, oil-based paint markers are ideal for use on porous and non-porous surfaces, including: stone, wood, glass, plastic, metal, leather, ceramic, marble, granite, glossy surfaces, paper, and more. Ideal for heavy duty industrial and professional applications, as well as for personalization and decorative purposes. Quick-drying vibrant colored paint resists water, sunlight, rough handling, and various chemicals; weather proof, fade proof, and acid-free making it archival safe. All medium point markers have a medium sized bullet tip and come in a wide style barrel with an ergonomic rubber grip for added comfort and a durable pocket clip on the cap.