Enjoy a great writing experience every time thanks to a plastic collar that prevents the tip from fraying. These Paper Mate pens use an acid-free, water-based ink that guards against bleed-through, so there's no need to worry about unwanted marks. Flair porous-point pens are ideal for writing and drawing every day. Felt tip provides bold and expressive lines that stand out on the page. Water-based ink won't bleed through paper. Bright, vivid ink glides on smoothly and dries in a flash to resist smearing and skipping. Write with ease using a comfortable grip. The sleek barrel tapers at the base for superior comfort and control. A click-seal cap keeps the tip fresh and moist and includes a metal pocket clip that makes it easy to carry. Acid free for archival use. Pens are not refillable. 1.0 mm porous-point pens create medium-width lines. Assorted barrels pens come in a pack of 4. Conforms to ASTM D4236 standards. For detailed information see www.astm.org. ACMI Certified AP Nontoxic. For detailed information see www.acmiart.org. Less harsh chemicals - made with fewer harsh chemicals, or safer chemicals than typical alternatives, helping reduce your use of and exposure to substances that may be more harmful to your health and the environment.