Enhance your writing experience with our practical pen refills. The black ink provides a bold and legible output, ideal for everyday use in the office or at home. The convenient press-type mechanism ensures that the pen is always ready for action. Features -Color:Black -Material:Plastic -Size:10.50X0.10X0.10cm/4.13X0.04X0.04in -0.7 mm refills: the 0.7 mm tip delivers a smooth writing performance, ensuring no breaks in ink flow -Quick replacement: these refills are designed for quick replacement, suitable for heavy writing tasks -Broad compatibility: compatible with many retractable ballpoint pens, these refills offer convenience and versatility -Reduced hand strain: the smooth ink reduces hand strain, making writing more enjoyable and less tiring -Smooth writing: suitable for writing tasks, these refills meet the needs of designers, students, and business professionals Package list: 100 x ballpoint pen refills(red) 100 x ballpoint pen refills(black)