Amazon.com : Kores K6 Retractable Ball Pen, Fine - 0.7mm, Black, Soft Grip, Triang. (Box of 12) : Office Products
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Amazon.com: Kores - K11: Coloured Ballpoint Pens, 1 mm Medium Point Biro with semi-Gel Ink for Smooth Writing, Triangular Ergonomic Shape, School and Office Supplies, Pack of 10 in Assorted Colours :