TWSBI ECO-T Royal Jade with Rose Gold Fountain Pen and InkThe TWSBI ECO T fountain pen boasts an incredible value with its piston filling system and affordable price. Like many other TWSBI fountain pens, it features a crystal clear acrylic barrel so you can see your ink level, and a green cap. The pen cap has an inner cap to ensure a perfect seal when stored away. It is completed with rose gold plated trim and a rose gold plated steel nib. The ECO T differs from the ECO in that it has a triangular grip