TWSBI ECO Smoke with Rose Gold Fountain PenTWSBI's Eco is a classic piston filler fountain pen! TWSBI fountain pens are a modern writing instrument that uses a traditional piston ink filling system and comes in a variety of finishes. TWSBI fountain pens are extremely reliable, but can also be disassembled and reassembled by their owner! This is a traditional fountain pen that modern day society can appreciate! The pens come equipped with a wrench and silicone grease. You won't need to use