Feature:1. Compatibility: These tips are compatible with any electromagnetic pen using standard D1 refills, including for Tech3, for Tech 4 and many multifunction ballpoint pens.2. Metal Construction: Crafted from premium metal, these ballpoint refills boast high hardness and wear proof performance, ensuring reliability and durability over time.3. Smoother Writing Experience: Featuring an oil based design, these D1 ballpoint pen refills offer smoother ink, requiring minimal pressure for effortless writing.4. Ultra Fine Tip Design: With a length of 66mm and an ultra fine 0.5mm tip, these refills provide greater accuracy, making writing tasks easier and more precise.5. Comprehensive Package: The package includes 10 replaceable ballpoint pen refills and 1 small tweezer for quick installation. Please note that the pen is not included.Specification:Item Type: Ballpoint Pen RefillsMaterial: MetalColor: SilverTip Diameter: Approx. 0.5mm / 0.02inLength: Approx. 66mm / 2.6inApplication: Compatible with any pen that uses a standard D1 replacement refill..Package List:10 x Ballpoint Refills1 x Small Tweezer