FriXion it - Remove your mistakes by rubbing with the eraser stud and watch the ink disappear Integrated Eraser Thermo-sensitive ink Refillable 0.7mm tip gives a 0.35mm medium line Expertly designed for accuracy and efficiency. With its thermo-sensitive ink, integrated eraser, and 0.7mm tip, it's a gamechanger for anyone who likes to get things right the first time. Engineered for success, Pilot's Frixion Rollerball Pen offers a medium 0.35mm line that's sure to elevate your writing experience.