TWSBI opaque \”Sky\” blue cap and piston knob with a clear barrel and section fountain pen. To fill with ink:unscrew the end cap,immerse the nib and feedinto ink, screw back the end cap, clean ink residue from nib and section. Nib are availableinEF, F, M, Band Stub1.1mm Pen cap willpostonto 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 outTWSBI Ink. These Inks made by TWSBI compliment this Pen. * This product is not eligible for discount codes