PILOT FriXion Ball Slim 0.38mm Erasable ballpoint pen 1 pc. This is the thinnest ballpoint pen in the FriXion series, featuring an ultra-fine 0.38 mm tip with erasable ink. Perfect for writing small, detailed notes in textbooks and other materials. The slim body takes up little space, allowing you to fit multiple pens in a pencil case. With its clip-free, slim and short design, it’s highly portable and easy to carry around. The pen is operated by pressing down the side knock button. *Not suitable for official certificates or addressing envelopes.