Ensure your Waterman ballpoint pen is always ready to produce bold, flawless lines. The pen ink refill is filled with intensely dark black 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 rich ink combine to create flawless lines on most surfaces.