Schneider One Business Roller Ball Pen 1pcSchneider One Business Roller Ball Pen Schneider One Business Roller Ball Pen Single Piece, features an ultra smooth tip for an optimal writing experience,. This pen, with a line width of around 0. 6 mm and blue, waterproof ink (ISO 14145 2 standard), is ideal for notes, signatures and visuals. The revolutionary Super Flow System ensures continuous ink flow from beginning to end. Its enormous ink reservoir has a level indicator, ensuring that every