Rite in the Rain Weatherproof Olive Drab and Flat Dark Earth Mini Bolt-Action Pens - Black Ink, 2 Pack (No. TAC20)

WRITES THROUGH: The permanent ink writes through water, grease, and mud without clumping or smearing., PRESSURIZED CARTRIDGE: All-Weather cartridge is manufactured in the USA by Fisher Pen Company. The pressurized ink writes in temperatures from -30F to 250F, under water (up to 35 ft), and any angle., PROPRIETARY INK: The ink and delivery system used exclusively in Rite in the Rain Refills will write without skipping in extremely wet conditions far better than other comparable weatherproof pens., INK DELIVERY: Tiny pockets in the pen's tip will deliver ink in the worst conditions without allowing water or air back into the Cartridge., RITE IN THE RAIN NOTEBOOKS: The most ideal pen for Rite in the Rain All-Weather Notebooks.