Quartet - EnduraGlide Dry Erase Marker, Black - Dozen 

Lasts up to 2 times longer than most standard dry-erase markers with patented three-chamber barrel that leaves a bold mark every time. Even flow ink insures a consistent line quality and reduces beading. For use on dry-erase boards, ceramic, glass and other non-porous surfaces. See-through barrel gauge indicates when ink level is low. Low-odor, quick drying ink erases easily so your presentations look professional time after time. Unique anti-roll cap.