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The nifty TWSBI Diamond 50 Ink Bottle is designed to match the TWSBI Diamond and Mini fountain pen range. Sporting specially-designed filling mechanisms, they work particularly well with TWSBI Diamond pens, but include features suited to filling almost any fountain pen.

An internal reservoir ensures that you can use the inkwell to fill almost any bottle-filled pen, even when the ink level is very low. Take this out, and the ink tube attached to the aluminium neck extends down to the bottom of the bottle, letting TWSBI Diamond pens fill themselves until your bottle is almost dry. Remove the nib and attach the pen to the end of the tube to fill, making filling easier and making spills less likely.

The end of the tube is also the same size as the opening in a standard International converter, so you can use the same method to cleanly and easily fill many brands of converter.

You'll be relieved to hear that there are full instructions!

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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.