brand new and high quality Features: Independent ink tube, easy to carry and use, take out the pen of the suction apparatus, and then put the ink sac, after a few seconds can be writing. Ink particles are fine, good fluidity, easy to plug the pen. With no break in ink flow, enjoy a smooth and optimal writing experience as your fountain pen glides elegantly across paper. The ink has been carefully manufactured using only natural dyes giving the composition a neutral, natural, and non-toxic PH. Ink takes only a few seconds to dry ensuring your important writing moments are not ruined by smudges or smears. Suitable for the pens with 2.6/3.4 mm caliber. Specifications: Material: Ink Length: approx.5cm/1.97in Optional Colors: Blue, Blue Black, Black, Red, Erasable Blue Caliber: 2.6mm / 3.4mm Quantity: 10 Pcs Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included: 10 x Fountain Pen Ink Sac (other accessories demo in the picture is not included.)