Specifically made for the Fisher Bullet Space Pen, these O-rings have a notch cut out to allow for air to pass between the chamber and the outside world.
You will receive 5 O-Rings in a plastic bag as 1 item purchased. If ordered with other items, they will ship separately.
This model will fit any any Space Pens with product numbers containing the following:
338/375/400/600/BCA
NOTE: These will NOT fit Bullet Grip Space Pens.
