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Amazon.com : Sound Feelings Long D1 Refills for Chromatic USA Double-Twist Pen (5) : Office Products
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Amazon.com : Sound Feelings Long D1 Refills for Chromatic USA Double-Twist Pen (1) : Office Products
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What exactly do I have here, and what type of refill do I need for it? The clip says CHROMATIC. : r/pens
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