Available in a variety of colors, refill is pressurized and will write under any condition: freezing cold and extreme heat, at any angle (including upside-down), on wet surfaces (even under water!) and on greasy surfaces. Refill will not only fit any Fisher Space Pen but many other brands of pen including Parker, Cross, Mont Blanc, Waterman, Universal, Paper Mate and standard ball point pens.
Medium Point Space Pen Pressurized Refill in black or blue.
Item Number: SPR4-A