Lionsteel Fisher Space pen refill Black medium SPR4 BK

Discover the next generation of writing with the Fisher Space Pen Refill Medium Black. This refill utilizes a patented hermetically sealed pressurized cartridge, guaranteeing exceptional performance in extreme conditions. Crafted for adventurers, professionals, and everyone in between, this refill ensures smooth writing, no matter where you are. Key Features Advanced Design: Dual-Chamber Cartridge: The refill incorporates an internal space divided into two chambers by a moving piston. The lower chamber holds a unique, highly elastic thixotropic ink, which stays solid at rest but liquefies when writing due to the ball's movement. Nitrogen-Pressurized Upper Chamber: Pressurized at 343 kPa, this chamber guarantees a consistent and adequate supply of ink to the ultra-hard ball made from a tungsten-carbide compound. Enhanced Capacity: Extended Body: Contains three times more ink than a standard ballpoint pen refill, offering prolonged usage and minimizing the need for frequent replacements. Longevity: The sealed design prevents the ink from drying out, with the manufacturer asserting a lifespan of up to 100 years.Versatile Writing: Writes in Extreme Conditions: Delivers reliable performance in any position—even upside down. Functional in temperatures ranging from -35°C to 120°C, on nearly any surface, underwater, and in oily conditions. Ink Specifications: Color: BlackLine Width: Medium, with a 1.1 mm ball diameter This refill is ideal for those who require a reliable writing tool capable of enduring the challenges of harsh environments and demanding applications.