Fisher Matte Black Zero Gravity Space Pen, Rubber Coated Barrel Sharpeners These cartridges can be used

These cartridges can be used with all fountain pens that hold two standard international ink cartridges (1-1/2" long)

so they may have some blue ink on the nib

Ribbed surface

Pink Cover

Fisher Matte Black Zero Gravity Space Pen, Rubber Coated Barrel Sharpeners These cartridges can be usedFisher Matte Black Zero Gravity Space Pen Features a non reflective, black rubberized grip coating The Zero Gravity Space Pen features a non reflective, black rubberized grip coating, a large, triangulated barrel, and an extra strength clip. Utilizing our Pressurized Ink Refill Cartridge, the Zero Gravity will write upside down, at any angle, under water, through grease, extreme temperatures ( 30 to +250 degrees F), on almost any surface, three times