Compatible with various pens: These cartridges are designed to fit most standard black ink pens, making them versatile and practical. You can easily replace the cartridges in your favorite expensive pen and extend its lifespan. High-quality material: These black ink cartridges are made of durable metal material, ensuring long-lasting use and a smooth writing experience. Excellent value: This pack includes 10 black ink cartridges, providing you with a long-lasting supply. Whether you're a student, professional, or simply love to write, these cartridges offer excellent value for money. Consistent ink flow: With a consistent ink flow, these cartridges provide a seamless writing experience. The ink dries quickly, preventing smudging and ensuring neat and clean writing. No bleeding: Say goodbye to messy pages! These black ink cartridges are designed to prevent the ink from bleeding through the paper, keeping your notes and documents clean and professional. 100% new and high quality Type: Black ink cartridges Size: 9.9 cm Color: Black ink Material: Metal Feature: The cartridge body is made of metal material, lightweight and smooth; The ink dries quickly with a consistent ink flow, does not bleed through, helps extend the life of your favorite expensive pen. Package includes: 10 pcs black ink cartridges Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3mm size error due to manual measurement.