Spiral-Shaped Ballpen Refill Packs Double the Ink

How do you fit double the ink into the refill of a ballpen? By twisting the tube into a spiral, that’s how. Called the T&T Pen-Ink Chamber, the helical coil fits into any regular pen barrel and sits there for twice as long as a normal refill.
The concept design makes much the refill’s reduced environmental [...]

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