Amazon.com : Edding 751 Paint Marker - Black - 10 Pens - Round Tip 1-2mm - Paint Marker for Labelling Metal, Glass, Rock or Plastic - Heat Resistant, Permanent and Waterproof : Office Products
Amazon.com: edding 90 glassboard marker - multi-coloured - 10 glass pens - round nib 2-3 mm - washable window marker pens - for writing and marking on glass surfaces such as windows