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I use anything that's cheap. I used to like nice, expensive pens and pencils but they're so easy to lose that I just settle for any old pen.
 
I cant believe nobody has mentioned the Pilot G2. Heavenly for such a cheap pen!

Yeah the Pilot G2 (05 for me ;)) is a great pen, I've been using it all throughout school and it just writes great for being a cheap pen you can pick up at any staples store
 
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