Posterman Biggie 30 Blue :
This marker has a large 1-1/4" wide tip that makes a 30mm mark. High opacity, water-based pigmented ink.
Suitable for marking on most surfaces, including glass, metal, paper, mirrors, wood, stone and plastic. Great on posterboard.
Works well for advertisements on chalkboards and glass surfaces. Marks stay on glass until you wash them off with glass cleaner. Marks wash off chalkboards with a standard household cleaning solution.
Safe / Non-Toxic.
Posterman Biggie 50 Bleu