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I have been keeping a collection of the tiny balls in pen ink cartridges since middle school. : r/mildlyinteresting
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uni-ball UB-188-L Rollerball Pens. Premium 0.7mm Medium Nib for Super Smooth Handwriting. Writes Like a Fountain Pen. Fade and Water Resistant Liquid Uni Super Ink. Box of 12 Blue Ballpoint Pens :
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