This set of 56 ballpoint pen refills comes with smooth flow ink in a classic black color for everyday use. The 1.0mm thickness provides a clean and crisp writing experience. Additionally, this set includes 7 red refills and 49 black refills for added variety in your writing. These refills are made with a combination of metal and plastic materials, ensuring durability and long-lasting use. Perfect for anyone in need of reliable and versatile pen refills.