This popular design was originally available only as 1.15mm pencil. Due to its popularity, Retro has added a rollerball in this lacquer finish. Now you can get your favorite mathematician a pencil and add this pen for a set! The capless rollerball point deploys with a twist of the knurled top. Tornado pens also fit any Parker-style refill. Create formulas with finesse in up to ten ink colors shown below.
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