Amazon.com : edding 90 Glassboard Marker - Black - 1 Glass Pen - Round nib 2-3 mm - washable window Marker Pen - for Writing and marking on Glass surfaces such as windows and Glassboards - Dry-wipeable : Office Products
Amazon.com: edding 3000 permanent marker - black - 1 pen - round tip 1.5-3 mm - quick-drying permanent markers - waterproof, smudge-proof - for cardboard, plastic, wood, metal, fabric - marker pens : Everything Else