Case with 4 Textsurfer Classic Vintage highlighters. The large ink reservoir of Staedtler 364 CWP4 markers ensures long life and makes it an ideal highlighter for marking text and coloring large surfaces . The ink is fast drying, water based and UV resistant. Staedtler's Ink-Jet Safe system prevents printed texts with inkjet equipment and handwritten ballpoint pens from being smudged. The black marker is especially interesting. This unit covers the texts with a black line that partially impedes their readability, however, the blocked text is invisible on photocopies .