Ideal for writing on CDs and DVDs, this Staedtler Lumocolour pen has an extra soft tip to prevent damage to sensitive surfaces and specially formulated ink, which will not penetrate to the data storage layer. Both smudge-proof and waterproof, the ink is fast drying for quick, convenient use. With a super fine line width of 0.4mm, this pen is great for writing clearly and neatly on the surface of the CD. This pack contains 10 black pens.