. . . "This Wallet Of Medium Lumocolor Permanent Pens from Staedtler contains 4 Lumocolor permanent pens with a medium nib, which can be left uncapped for days without drying up.These Design awarded universal pens give a superb colour brilliancy and are perfect for use on overhead film, CD's and DVD's and almost all surfaces including metal, polystyrene, glass, porcelain, wood, leather and stone.The Lumo" .