This bolt-action pen is a premium writing device that is fully waterproof so you are prepared to write in any condition. The pressurized Rite-In-The-Rain ink allows you to write in any direction and in extreme temperatures from -30f to 250f. Plus, it’s fully waterproof when used with Rite-In-The-Rain notepads. The bolt-action design is inspired by the M16A4 series rife. Simply push, turn and release the clip to trigger the pen point.