These refills perfectly fit your Earth Greetings Premium Refillable Metal Pen.
Ink: Black Gel
Tip: 0.5mm for smooth writing that won't bleed through your page.
To replace the cartridge in your pen: Remove the pen's cap, unscrew the pen's tip and make sure you put the little spring to one side. Remove the old cartridge. Pop the spring onto the new refill, and insert back into the pen. Screw the tip back on and you're done!