The TWSBI ECO-T Blue has a more pronounced grip section so that it helps children and beginners new to fountain pens achieve the correct grip and produce better hand writing. Both the cap and the end cap have new triangular design which also sets the ECO-T Blue apart from other ECO fountain pens. Like all other ECO's, the ECO-T Blue features transparent barrel and TWSBI's innovative piston-filling mechanism. So it's the perfect writing instrument for everyday use for beginners and enthusiasts alike. The ECO-T Blue can be fully disassembled for cleaning. Comes with a 1.1 stub.