PEN REFILLS: Rite in the Rain All-Weather Pen ink refill cartridges will write for a considerable amount of time. When your ink finally runs out, this refill will get your trusty All-Weather Pen back into the field. Don’t worry about the refill fitting your pen; most Rite in the Rain All-Weather Pens use the same pen refill style.

• WRITES THROUGH: The permanent ink writes through water, grease, and mud without clumping or smearing.
• PRESSURISED 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.