uni-ball Power Tank RT Ballpoint Retractable Pen, Blue Ink, Bold, Dozen (42071)

I purchased these as they're able to write on wet paper and upside down. I have this with my field notes that uses waterproof paper as I find myself needing to jot down notes in all weather conditions, including in the rain. There are other pens on the market that offer the same features, but the uni-ball power tank is cheaper and, to be honest, much nicer to write with. I recommend this pen.

Scrivono sempre e in ogni condizione. E' il secondo pacco che compro non è mai capitato che perdano inchiostro. Le uso soprattutto per scrivere le parole crociate a letto quindi scrivono anche rivolte verso l'alto.

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Producto que excede la calidad ofrecida

These work as advertised-- they write with beautiful flowing ink, easily in all orientations and are permanent on many surfaces. They work as well when they are cold. It's just a fine writing implement If you need something that will write reliably in any environment!