The Artline Dual Nib CDR/DVD-R marker is a type of marker specifically designed for writing on CDs, DVDs, and other optical discs. It typically features a dual nib design with a fine tip on one end for detailed work and a broader tip on the other end for broader strokes. These markers are usually water-based and quick-drying to prevent smudging on the disc surface. They are commonly used for labeling discs with text or designs.

The features of a CDR/DVD-R Dual Nib marker typically include:

1. Dual tip: It comes with a fine tip for precise details and a broader tip for wider strokes.
2. Water-based ink: Most of these markers use quick-drying water-based ink to prevent smudging on the disc surface.
3. Non-toxic: They are generally non-toxic and safe to use on optical discs.
4. Permanent: The ink is water and fade-resistant, ensuring that labels on discs remain legible over time.
5. Specially designed: It is specifically designed to write on CDR/DVD-R discs without damaging the surface or affecting the disc's quality.

These are some common features found in CDR/DVD-R Dual Nib markers.