These refills are specifically made for your Sea Gems pen, to extend its life further than just one ink cartridge and to keep those gestures from friends and loved into the future.
There are different types for different pens, to see which one you need simply ‘break’ your pen at the middle, the chrome bands usually denote where this point is. The refill is inside the bottom half, you may need to screw it out.
Some take a smaller size and so a pack of two refills is supplied for the same price as one larger cartridge.
By Sea Gems.