Black 0.7mm Multi-Functional Ballpoint Pen Refills, 10 Pack

This oil-based ballpoint pen refill features black ink and is designed for use with multicolored and multifunction pens. It has a ball diameter of 0.03 inches (0.7 mm), providing smooth writing performance. The refill is suitable for various pen models that accommodate this size and ink type, offering reliable ink flow and consistent lines.