Counter pen features built-in Agion technology, a deluxe chrome-plated holder, and 24" high-strength ball chain attached to square self-adhesive base. Square adhesive base firmly adheres to any flat surface. Built-in Agion antimicrobial technology with A.J. silver zeolite suppresses the growth of algae, mold, mildew and bacteria on the pen. High-density ink is acid-free and water-resistant. Deluxe counter pen uses refill pen with 2" chain.