TWSBI ECO-T Royal Jade Rose Gold Midnight Blue Ink Set. TWSBI included even more rose gold on this limited edition ECO-T and to make the perfect gift they have included an 18 mL bottle of their Midnight Blue ink.
The ECO-T has a more pronounced triangular grip section to ease holding the pen as well as a triangular-shaped cap and piston nob (instead of the traditional TWSBI hexagon shape).