Features: Long-Lasting and Easy to Replace: These 10pcs 3. 4mm Universal Ink Refills provide a reliable and consistent ink flow. With their replaceable design, you can easily switch out the ink refills whenever needed, ensuring a long-lasting writing experience. Smooth Writing Experience: The 3. 4mm Bore Diameter Fountain Pen offers an easy and smooth writing experience, allowing you to effortlessly glide across the paper. Say goodbye to any potential blockages that might hinder your writing flow. Versatile Usage: Ideal for studying, working in the office, or as student stationery accessories, these Fountain Pen Replacement Refills are suitable for various writing tasks. Whether you're making cards or writing letters, these refills will meet your needs. Consistent Ink Flow: The 10pcs 3. 4mm Replaceable Ink Refills ensure a consistent and reliable ink flow, providing you with clear and precise writing every time. No more interruptions or smudges while you work or study. Durable and Reliable: Crafted with a long-lasting replaceable ink sac, these refills are built to withstand regular use. You can trust that they will deliver premium-quality performance and maintain their functionality over time. Specification: Material: Ink Size: 5.2*4*1.7cm Notes: Please allow slight tolerances in size due to manual measurement, and lighting in photography may result in a difference in color than in real. Include: 10*Ink Refills