NOTE: Only black color works as a pen. I was looking for a cap to use the end of my pencil for wiring instead of my sometimes dirty fingers or the hard end of the pencil. A search on Revain led me to a Cozy cap that seemed to fit the bill. However, changing the "color" on this page to glow in the dark version will break the capacitive ability to act as a stylus. Upon further investigation, it looks like the white version can't function as a pen either. I'm stuck right now with a useless rubber cap that glows in the dark at the moment. If you're looking for a cap that doubles as a pen, don't buy the Cozy Glow-in-the-Dark cap or the white cap.
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