Ballpoint pen refill with blue ink features high-quality ink that never dries out and works beautifully on most surfaces for consistently flawless results. Medium point creates smooth, solid lines for excellent visibility. Easy-to-use design allows quick replacement for simple operation. Pen refill is designed for Waterman ballpoint pens (sold separately).Ballpoint pen refill with blue ink features high-quality ink that never dries out and works beautifully on most surfaces for consistently flawless results. Medium point creates smooth, solid lines for excellent visibility. Easy-to-use design allows quick replacement for simple operation. Pen refill is designed for Waterman ballpoint pens (sold separately).