File:Gel pen versus ballpoint pen.jpg - Wikimedia Commons
Amazon.com: PILOT G2 Premium Refillable and Retractable Rolling Ball Gel Pens, Extra Fine Point, Black Ink, 12-Pack (31002) : Everything Else
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Amazon.com: SMOOTHERPRO Premium Retractable Gel Pens 12 Pack 0.5mm Fine Black Refillable Ballpoint Pen Set with Comfortable Rubber Grip Super Smooth Long Lasting Writing (SL120) : Office Products
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Amazon.com: uni-ball Impact Gel Pens, Bold Point (1.0mm), Metallic Silver, 12 Count : Everything Else
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