Staedtlers CD and DVD pen is a new and practical development in the Lumocolor range. Its ink has been developed especially for permanently marking CDs and DVDs with a formula designed not to penetrate their data storage layer. The CD and DVD marker is also protected by and extra soft tip to stop the writing from smudging and blurs with fast drying 3 to 6 second ink. Thanks to Drysafe technology, the Lumocolor marker can be left uncapped for days at a time without drying up. Extra fine line, 0.4mm. Purchasing each unit.