The Rite in the Rain EDC Pen functions in extreme conditions. Stash anywhere. Write everywhere. If you need a handy all-weather pen, this value pack is for you.FeaturesWrites upside down Convertible cap snaps securely onto end of pen creating a comfortable standard-size barrelPressurized ink cartridge performs in temperatures from -30F to 250F, under water (up to 35 ft), and at any angleProprietary ink and delivery system used exclusively in Rite in the Rain Pens will write without skipping in extremely wet conditionsPermanent ink writes through water, sweat, grease, and mud without clumping or smearingComes in a 2 packPen Size: 3.25" L Closed, 5.25" L Open, .4373" DWeighs .05lbs