Schmidt 635 D1 Mine Ballpoint Refill - Black, Blue, Green, Red Ink (Medium Tip 0.7mm) - Pack of 8

** Schmidt 635 D1 Mine Ballpoint Refill** The Schmidt 635 D1 Mine Ballpoint Refills in various colors offer a good balance of quality and performance, appealing to pen enthusiasts and casual users alike. Most customers commend the smoothness and reliability of the ink, noting the refills deliver Consistent writing experiences without leaks or smudges, which is essential for daily use. The pack includes a diverse selection of colors—black, blue, green, and red—allowing users to customize their writing according to preference. While the majority of feedback highlights satisfaction with the writing quality, it's crucial to note that some users faced compatibility issues, specifically with the Sailor Pro Gear ballpoint pen. The refills are slightly thicker than expected, causing them to get stuck in the pen barrel. This underscores the importance of verifying compatibility before making a purchase. Overall, customers have expressed high regard for the Schmidt brand, praising their customer service and the Consistent performance of their products. The variety pack was particularly appreciated, making it an excellent choice for those looking to stock up on quality ballpoint ink in multiple colors. However, a few users reported drying issues with certain refills, indicating potential quality control concerns. **