Zalantan Black Ink Cartridge for Fountain Pen Ink Cartridge Refillable Business Writing Pens Disposable Ink Pen Refills 3.4 mm Bore Diamete Set of 60 Refill

• 【Diameter & Size】Disposable Ink Pen Refills 3.4 mm Bore Diameter, Length Appr 51mm; Cartridge Diameter Appr5-7mm. Ink content 0.9g / per stick. PS: These cartridges are not Standard Size, please ensure they work with your fountain pen before purchase!
• 【Abundant Quantity】This package contains 60 pieces of pen ink, six small boxes, a box of 10 packs, easy to carry. Compared with the traditional ink bottle, travel, signing contracts, and a variety of occasions that need to use pens can carry these easy-to-carry conversion ink tube Cartridge fillers
• 【How to Install】Remove the pen cap: remove the pen cap, pen barrel and ink absorber Install the ink cartridge: Gently align the thin end of the ink capsule with the bayonet, and then press firmly until you hear a "click" sound. Confirm that the ink cartridge is installed: After installing the ink Cartridge in the pen, you can gently shake it to speed up the flow of ink, and then the pen can be used.
• 【Smooth Ink Flow】our fountain pen ink slides on the paper smoothly and is unobstructed, and ink takes only a few seconds to dry, so the handwriting is not easily stained when you write or draw.
• 【NEUTRAL PH AND NON-TOXIC】 The ink is carefully crafted using only natural dyes, giving the composition a neutral, natural, and non-toxic pH.

Note: Please check if the size matches the one you need before buying. 1. Align the ink sac finely with the bayonet and press firmly until you hear a click. 2. After installation, leave the pen upright for one minute to write. 3. Press hard. Bore diameter:3.4mm