This is a set of 10 Pilot Frixion erasable color pens (gray, brown, pink, violet, navy, green, coral pink, pale orange, soft green, and orange). I've used them about 4 times, but there's still ink left and they're usable. 【Erasable Ink】 These markers use erasable ink, allowing you to easily correct typos and mistakes. They are especially useful for students and in business settings. 【Easy-to-Use Design】 They feature an easy-to-hold shape and smooth writing feel, designed to reduce fatigue even during extended use.