50 pcs Extra Large Ink Capacity 0.5mm Black Gel Fineliner Rollerball Pens Value Pack Last 1600m 1=4 Normal Pens Use For School Office Daily Writing Drawing SketchingThese pens have a 0. 5 mm nib size and a rollerball tip for smooth writing. They are ideal for everyday writing. They use a unique liquid ink flow system that ensures continuous flow and high writing performance until the very last drop. These pens have black ink. This is a pack of 50 pens. Large ink capacity lasts for 1600 m, equals to 4 normal pens.