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The TWSBI Diamond Mini Fountain Pen is a pocket-sized fountain pen with a piston filling system, making it a great daily workhorse at a pocket-friendly price. This small but mighty fountain pen features a clear acrylic body, clear transparent cap and turning knob, chrome trims, and stainless steel nib for a smooth writing experience. This pen runs smaller in length than the Diamond 580. Its piston filling system provides a large ink capacity for such a small pen, and the clear body allows you to view the level of ink remaining at all times. The pen feels sturdy and well-made, and when posted, behaves like a full-length pen. With its pocket-friendly price tag, the TWSBI Diamond Mini Fountain Pen is a daily workhorse and a cute, stunning writing instrument.