Ensure your Waterman ballpoint pen is always ready to produce fine, flawless lines. The pen ink refill is filled with intensely bright blue ink for enduring impact and clarity. Refilling is easy with the Waterman ballpoint pen refill. To replace, simply unscrew your Watermen pen, remove the empty cartridge and reassemble the body. The durable medium point and vibrant ink combine to create effortlessly bold marks.