This Pilot Refill for Dr. Grip Center Of Gravity Pen is a perfect choice for those who want to achieve professional-level writing. The medium-sized refill is designed to work with any ink-based pen and provides a smooth, effortless writing experience. With its black color and Pilot brand name, this refill is a reliable option for anyone who wants to produce high-quality writing. The 6-pack of refills ensures that you always have a spare on hand, while the easy-to-use design makes it simple to install and use. Whether you're a student, professional, or anyone who loves to write, this Pilot Refill is a must-have accessory for your writing collection.