TWSBI Eco Fountain Pen - Fluorite Purple with Bronze Trim and NibA striking purple pink with bronze The TWSBI Eco Fluorite Purple with Bronze trim uses a mixed resin finish that combines purple tones with lighter pink variation, for a softer, more atmospheric take on the Eco series. Bronze trim adds warmth and contrast, while the rest of the design stays consistent with the standard Eco piston filler platform. What sets it apart Fluorite mineral inspired mixed resin with natural variation between pens Bronze trim