MAM-A Black CD/DVD Marker. Product ID: MAM-AMarker.The MAM-A Black CD/DVD Marker is a water-based, non-toxic, permanent marker that will not damage your CD-R’s and DVDR’s. Ordinary felt tipped markers use solvents that can attack the protective coating on CD-R’s and DVDR’s, and ruin your data or music. You can tell by the strong smell of a marker, that it’s generally an unsafe, solvent-based pen.If you do need to write on your blank media, do it safely, with theseMAM-A Black CD/DVD Markers. They use a fine point marker tip, so that you can write effectively.