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Porsche Design's new Shake Pens will appeal to those who like a perfect balance of form and function. The pens house a mechanism that allow their ballpoint tips to retract and extend with a simple shake of the wrist.

The pens will cost north of $200 (for the black version), but the silver version will be a tad bit more affordable at $130.

Check out the demo in the video below: [Porsche Design via Notcot]