Ensure that your Waterman rollerball pen is always ready when you need it with this rollerball refill. To replace, simply unscrew your Waterman pen, remove the empty cartridge and reassemble the body. The ink in this high-quality refill is smooth-flowing and expressive. Waterman rollerball pens unite the tradition of liquid ink with the ultimate comfort and convenience of a ballpoint pen. Classic blue ink inspires endless creativity Fine tip is ideal for small, precise writing Writes on most surfaces for total free reign of your creativity Refill Blue Fine Nib, Blister of 1 WATERMAN Ink Refill for Rollerball Pens, Medium Point, Blue (540961). The ink in this high-quality refill is smooth-flowing. Long-lasting refill fits WATERMAN rollerball pens. WATERMAN rollerball pens unite the tradition of liquid ink with ultimate comfort and convenience.