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TWSBI Diamond Mini Fountain Pen Clear. Transparent crystal-clear diamond-faceted barrel reveals the filling mechanism, a built-in piston-filler with a very smooth action, whilst also allowing an uninterrupted view of the ink level and colour. Chromed metal trim and pocket clip. TWSBI logo nicely finishes the top of the pen's cap. Rubber o-ring on cap thread ensures an airtight seal to prevent ink drying out in the pen, whilst also ensuring that the cap is firmly attached when not in use.

The end of the barrel is threaded to allow secure posting of the cap on the back of the pen.
After 40 plus years as an OEM manufacturer for different global brands, Ta Shin Precision decided to start selling under their own brand, and thus TWSBI was born.

TaShin Precision has over 40 years of experience in manufacturing with plastics and metals. Early products ranged from toy lego parts to high end writing instruments. This knowledge trickles down into every product TWSBI has to offer.