Jinhao Fountain Pen Ink Cartridges Blue Color, Set of 50 Refill Ink Cartridges International Standard Size, 2.6 mm Bore Diameter

• 50 PCS 2.6 mm bore diameter black ink cartridges ( compatible with fountain pens take 2.6mm cartridges such as Jinhao ).
• Length Appr 50mm; Cartridge Diameter Appr4-6mm; bore diameter 2.6mm. If you not sure if they works with your fountain pens, just send us a message to confirm this.
• The ink Cartridge has been carefully manufactured using only natural dyes giving the composition a neutral, natural, and non-toxic PH.
• With no break in ink flow, enjoy a smooth and optimal writing experience as your fountain pen glides elegantly across paper.
• If there is any reason you do not like our item, just send us a message, we can offer you a full refund or replacement!

Jinhao ink cartridges International Standard Size Instruction on how to fill a fountain pen with cartridges: Remove the conver by gently pulling it away from the nib. Insert a fountain pen cartridge into the nib and push firmly until the cartridge seats itself. You will hear a small click. When you fill the pen at the first time, sway the pen to make a few drops of ink coming out of the nib, so that it can flow easily.