Amazon.com : STAEDTLER Triplus Ball, Point Pen, Extra Bold Colored Ink Pens, Medium 1mm Tip, Blue, 437 XB-3 (437 XB-3 VE) : Office Products
3pcs Staedtler Triplus Ball 431 Triangular Ballpoint Pen Gel Pen F 0.3mm/m 0.45mm Black/blue/red Color Office And School Supply - Ballpoint Pens - AliExpress