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Knock Retractable Gel Pen?

gel knock Pen retractable
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Knock Retractable Gel Pen?

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DONG-A U-Knock is the world’s first patented U-spring technology which started the innovations of retractable gel pen. The U-spring technology supports the ball with minimal wear when writing and delivers superior writing smoothness. The silky smooth dyestuff ink is non-toxic and confirms to ASTM-4236. It is retractable and the rubber grip provides hours of comfortable writing.

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