The OEM Pentel WOW! K437 Permanent Gel Pen comes in a set of 12, featuring a unique triangular-shaped barrel and grip for comfortable handling. The permanent, smooth-flowing ink is waterproof, fade-proof, and acid-free, ensuring a lasting impression. Its stylish transparent barrel allows you to monitor ink supply, and the convenient clip makes it easy to attach to pockets or notebooks. This gel pen also has a push top to advance the tip and a side button for retraction, providing both functionality and ease of use.