Retro 1951 Easy Flow 9000 Ballpoint Ink Refill, Blue 3 Pack. This smooth writing ballpoint refill can be used for the Retro 1951 Tornado collection (all models EXCEPT Elite and Fountain pens). Most Tornado pens come equipped with a roller ball refill (Retro item# REF5P), but you can easily convert your Tornado to a ballpoint with the Easy Flow. Manufactured in Germany, these refills are engineered with the finest cutting edge ink technology. They measure 3.8 inches in length and 0.2 inches in diameter, and are sold in a 3 pack.