TWSBI Eco green piston filler fountain pen with glow in the dark cap and barrel end cap To fill with ink: unscrew the end cap, immerse the nib and feed into ink, screw back the end cap, clean ink residue from nib and section Nib are available in EF, F, M, B and Stub1.1 Pen cap will post onto the back of the pen Pen cap has an inner cap to insure a perfect seal to keep the nib from drying out when not in use. Check out TWSBI Ink. These Inks made by TWSBI compliment this Pen. * This product is not eligible for discount codes