Don't let mistakes in your writing or drawing bother you anymore: Pilot's Frixion Colors felt pens feature uniquely formulated Frixion ink that you can easily erase by running the rubber tip on the cap over your work. Not only is this very convenient, you can also use the pens' erasable qualities to create interesting effects by erasing only parts of the ink., The medium tip of the Pilot Frixion Colors pens has a line width of 0.63 mm, while the orange ink flows smoothly across the page.