CD-R/DVD markers are specialized pens used for writing on the surface of CD-R (Compact Disc Recordable) and DVD (Digital Versatile Disc) media. Here are some key points about them: Permanent Markers: These are usually oil-based and can write on various surfaces. They are not recommended for CDs/DVDs as they can damage the disc. Water-Based Markers: These are safer for discs but may smudge if not allowed to dry properly. Specialty CD/DVD Markers: Designed specifically for writing on optical discs, these markers typically use non-toxic, acid-free ink that is safe for the disc surface. Features: Non-toxic Inks: Many CD/DVD markers use non-toxic inks to prevent damage to the disc. Quick Drying: These markers often dry quickly to prevent smudging. Fine Tip: They usually have a fine tip for precise writing. Usage Tips: Labeling: Use the marker to write the title, date, or contents of the disc. Avoiding Damage: Always write on the label side and avoid the data side to prevent data loss. Storage: Store discs upright to avoid scratches on the label side.