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