Kindly remind: Please completely remove the wax tip cover on the new refill before inserting the new refill into the pen’s barrel. Otherwise, the remaining wax tip cover may lead to fitting and writing issues. Specification: Ink color: Black length: 3.9 inch Tip: 1.0 mm Top writing quality: Black ink refill has smooth writing, waterproof, fast drying performance. The ink dries quickly to prevent smudges, making the paper look elegant and tidy. Universal compatibility: The replacement ballpoint pen refill is compatible with many ballpoint pens, help extend the life of your favorite expensive pen. Multipurpose: These refills are suitable for work, school, hotel, restaurant and various writing occasions; Nice refills for office supply, school stationery, family use. Kindly remind: Please completely remove the wax tip cover on the new refill before inserting the new refill into the pen’s barrel. Otherwise, the remaining wax tip cover may lead to fitting and writing issues. Specification: Ink color: Black length: 3.9 inch Tip: 1.0 mm Top writing quality: Black ink refill has smooth writing, waterproof, fast drying performance. The ink dries quickly to prevent smudges, making the paper look elegant and tidy. Universal compatibility: The replacement ballpoint pen refill is compatible with many ballpoint pens, help extend the life of your favorite expensive pen. Multipurpose: These refills are suitable for work, school, hotel, restaurant and various writing occasions; Nice refills for office supply, school stationery, family use. Dimension - The total length is 9.9cm (3.9 inch) 1mm medium tip black ink Smooth writing quality - The body of the refill is made of stainless steel, feeling light and premium Fit various writing occasion - Metal ballpoint pen refill is suitable for office, business, school and home etc. The high - Quality refills with 1.0mm point provide a smooth and consistent ink flow for a superb writing experience Package: (Black ink refills pack of 6); Carefully compare the look and dimensions of the refill to match the original refill before purchasing.