The Sheaffer K blue ballpoint pen refill F 99324 is a fine point (F) refill designed to ensure precise and defined lines in Sheaffer ballpoint pens. Filled with quick-drying, high-viscosity blue ink, it prevents smudging on paper and under your hands. The fine point is ideal for small handwriting, sketching, and filling out forms. Essential for maintaining the original performance of your Sheaffer pen.