TWSBI Eco Fountain Pen - Black Marble with Bronze Trim and NibA black and bronze Eco with variation The TWSBI Eco Black Marble with Bronze trim uses a mixed resin finish that combines deep black tones with lighter grey variation, giving each pen a slightly different pattern. 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 Black marble inspired mixed resin with natural variation between pens Bronze trim for a