For laying down dense, even-flowing lines of controlled widths. Any type and color of ink can be used in refillable ink reservoir. Tubular nib handles like a pencil, moves in any direction, on virtually any drawing surface. - Koh-I-Noor Rapidograph Pen Replacement Point - 3x0, 0.25 mmKoh-i-noor Rapidograph Pen, REPLACEMENT PT 000 -