The Pilot FriXion Ball 0.7 mm: A Reliable Erasable Pen for Everyday Work
When I write mathematical proofs, clarity and precision matter. A single misplaced symbol can alter the entire meaning of an argument. That is why my writing tool must be reliable, smooth, and forgiving. After years of trying different pens, pencils and fineliners, I now rely on one tool for all my handwritten proofs: the Pilot FriXion Ball 0.7 mm . This pen has become an essential part of my workflow. It writes smoothly, erases cleanly and can be refilled easily, making it ideal for long mathematical sessions where neatness and accuracy are critical. Video Review (1 Minute) Here is a short demonstration showing the pens up close and how the ink writes and erases. Why This Pen Works Perfectly for Mathematical Proofs Proof-writing is a process of refinement. You revise, adjust, correct and restructure your ideas repeatedly. With most pens, each correction introduces visual noise — scribbles, crossings-out or rewritten pages. The FriXion Ball removes that issue entirely....