Keep your counter pen ink flowing with the School Smart Rubberized Counter Pen Refill. A security ink pen is your economical solution to high-traffic areas or public environments where a writing utensil is frequently needed. Medium nib tip (at 1 millimeter size) has black ink that is tamperproof, waterproof, and fadeproof for smooth, non-skipping write. Regulated ink flow helps to avoid scratching and bobbing. Pen comes with short, steel chain at the top and easily snaps onto base (sold separately) when it’s time to refill. Use this Refill for School Smart Rubberized Barrel Counter Pen (Item 1599838); sold separately.