1 Each. Counter refill pen is designed for use with Iconex Preventa Metal Tip Counter Pens and Deluxe Counter Pens. Built-in Agion antimicrobial technology offers protection for the pen to suppress bacterial and fungal growth. Chrome-plated brass tip adds durability. High-density ink is acid-free and water-resistant. Pen features a 2" ball chain to attach to the Counter Pen's chain and base.