The OEM Chain Pen NSN4631990 is a ballpoint pen featuring a 24" steel-ball chain and an upright, swivel holder. It has a rubberized barrel with a grooved grip for enhanced writing comfort. The base and barrel are designed to match the ink color, ensuring a cohesive look. This pen uses permanent, long-lasting ink that is airplane-safe and highly reliable, making it suitable for writing on nearly all types of paper.