TWSBI ECO Espresso Bronze Fountain PenThe TWSBI ECO 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 dark brown cap and finial. The pen cap has an inner cap to ensure a perfect seal when stored away. It is completed with bronze trim and a bronze colored stainless steel nib. TWSBI's belief is that it is important to allow the user