Pen-style Permanent Markers contain nontoxic bold ink that provides high visibility on almost any surface including cardboard, metal and plastic. Permanent ink is low-odor, quick-drying, water-resistant and rub-resistant. Durable bullet tip offers fine point marking and consistent line width. Each permanent marker features a pocket clip so you can attach the marker to binders and pockets. ACMI Certified (conforms to ASTM D-4236).