This is a refill for the Munhwa Campus ballpoint pen, featuring 0.7mm black ink in a 1-dozen (12 count) pack. It is a Korean-made consumable product that allows you to easily replace the ink when the original pen runs out. It is economical for environments with high writing volume, such as offices or schools, and is supplied as a finished product without separate printing or engraving. It is a practical configuration designed to reduce stationery maintenance costs through bulk purchase.