10 Pcs/ SetYou will get 10 pieces of black ink metal pen refills for ballpoint pens. Sufficient quantity black ink refills will fully meet your demands of daily writing, marking, and signing.Suitable SizeThe length of gel ink refill is approx 3.86 inches (9.8 cm). The tip model of the ballpoint pen refill is 1 mm. Gel pen refills can fit most ballpoint pens.High QualityThe shell of the pen replacement refill is made of quality metal, the ink inside is also made of quality material, with high color rendering and flows evenly, so the entire pen refill is very durable, allows you to write smoothly on paper.1mm Black Pen RefillsBuilt-in precision ink output regulator, which can ensure liquid ink flowing evenly that give you a smooth writing experience. Fine ballpoint pen refills are perfect for drawing, writing, sketching, and illustrating.Wide applicationmetal ballpoint pen refills are suitable for school, office, and home. Ideal for writing, journaling, note-taking, underlying, sketching, and more. They are also non-toxic and acid-free. A perfect choice for your everyday use.