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TWSBI Diamond 580 Clear is a classic fountain pen with a piston ink-filling system. By fusing the traditional mechanisms of the fountain pen with a modern industrial design, this is an eye-catching fountain pen that is simultaneously appreciative of the past and relevant in the present. The Diamond 580 comes with a benchmark ink-filling mechanism and has all detachable parts. TWSBI fountain pens are loved for their high quality and affordability. This luxurious writing instrument features a stylish and elegant design, with a clear transparent aluminum grip section, a clear demonstrator body, and a stainless steel nib. The piston filler mechanism ensures a huge ink capacity and a smooth and consistent writing experience, providing a very precise and crisp line variation. The screw-cap and piston knob contrast against the transparent faceted barrel, giving this pen a unique, sophisticated look. No matter your writing style, the TWSBI Diamond 580 Clear Fountain Pen is sure to provide you with an enjoyable and reliable writing experience.