ForeverPen
This tiny writing instrument goes anywhere and never needs ink. It uses a special silver composite tip that can leave its mark on a wide variety of surfaces. It measures less than 1″ long, and can also be used for opening boxes. Choose from titanium, copper, or brass variants.
Crowdfunded projects pose a degree of risk for buyers, so be sure to do your research and fully read the seller's detailed description and production plans before plunking down your hard-earned money.
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