PRECISE LINES: These black felt-tip pens deliver crisp, clean marks at 0.6 mm line width on paper, acetate, metal, and glass – waterproof pens built for neat, organised workflows WORKS ON VIRTUALLY ANY SURFACE: This black permanent marker writes on almost any surface with a smear proof, waterproof finish – from OHP transparencies to plastic, this overhead projector pen performs reliably and cleanly every time QUICK-DRYING: The ink dries in seconds to prevent smudging – engineered for industrial marking rather than craft use, so you can work cleanly and confidently without waiting around COMFORTABLE CONTROL: A sturdy polypropylene barrel and ergonomic shape give these marker pens a secure, confident grip – ensuring precise control even during extended use in the office, workshop, or on the factory floor DURABLE PERFORMANCE: DRY SAFE technology prevents the ink from drying out if the cap is left off, and the pen is refillable using Refill Station 487 17 – these waterproof pens deliver consistent, reliable results year after year