ZEBRA Emulsion Ink Ballpoint Pen "Surari" 0.7mm Blue x 5. This is the first ballpoint pen in the world to use emulsion ink, which combines the firmness of oil-based ink with the lightness and fluidity of gel (water-based) ink. The result is an unprecedentedly smooth writing experience and vivid, dark writing lines. It can also be used for official documents. The shaft and other parts of the pen are made of recycled materials, and it has acquired the Eco Mark.