* The Staedtler Textsurfer Classic highlighter is designed with a large ink reservoir for extended highlighting performance. * The fast-drying pigment ink is light-fast and will not smudge ink-jet printing or most handwritten inks.* It even features an automatic pressure equalization system that prevents the highlighter from leaking on board an aircraft. * The eco-friendly design is refillable with the Staedtler Textsurfer Refill Station, and features a handy clip on the cap. * The Purple and Turquoise colors are copy-proof, and will keep your text visible in photocopies. Multiple ink colors available.