Introducing the 10PCS D1 Ballpoint Refills, designed to elevate your writing experience with precision and ease. These ultra-fine, metal refills are perfect for anyone using electromagnetic pens, ensuring compatibility and performance that meets your needs. Compatibility: These D1 ballpoint refills are compatible with any electromagnetic pen that uses standard D1 refills. This includes popular models such as Tech3, Tech4, and many multifunction ballpoint pens. Enjoy the versatility of these refills, making them a perfect choice for various writing instruments. Metal Construction: Crafted from premium metal, these ballpoint refills are built to last. Their high hardness and wear-proof performance ensure reliability and durability over time, allowing you to write with confidence knowing that your refills can withstand daily use. Smoother Writing Experience: Experience the difference with our oil-based design, which provides smoother ink flow. These D1 ballpoint pen refills require minimal pressure for effortless writing, making them ideal for long writing sessions, note-taking, or creative projects. Ultra Fine Tip Design: Each refill features an ultra-fine 0.5mm tip, measuring 66mm in length. This design offers greater accuracy, making writing tasks easier and more precise. Whether you’re jotting down notes or creating detailed sketches, these refills will help you achieve the results you desire. Comprehensive Package: Each package includes 10 replaceable ballpoint pen refills and 1 small tweezer for quick and easy installation. This thoughtful inclusion ensures that you can effortlessly swap out refills as needed. Please note that the pen itself is not included, allowing you to upgrade your existing writing tools. Upgrade your writing experience with the 10PCS D1 Ballpoint Refills. Perfect for students, professionals, and anyone who values precision in their writing, these refills are a must-have addition to your stationery collection. Order yours today and enjoy the smooth, reliable performance that these high-quality refills provide!