<b>Top writing quality</b><br> Black ink refill has smooth writing, waterproof, fast drying performance. The ink dries quickly to prevent smudges, making the paper look elegant and tidy. Gives you a Unbeatable writing experience.<br> <br> <b>Universal compatibility</b><br> The replacement ballpoint pen refill is compatible with many ballpoint pens, help extend the life of your favorite expensive pen.<br> <br> <b>Long life & Durable</b><br> The life of the refill is quite long. Refill pen body made of metal stainless steel, and there is a lot of ink in the refill, the filling tip is sealed with a protective wax, which means that the extra refill you store will not dry out while waiting for use.<br> <br> <b>Multipurpose</b><br> These refills are suitable for work, school, hotel, restaurant and various writing occasions; Nice refills for office supply, school stationery, family use. lightweight and portable, easy to carry.<br><br> <b>Specification:</b><br> Ink Color: Black<br> length: 3.9 inches<br> Tip: 1.0mm<br> Material: Stainless steel<br> Package: 15 refills in a self-sealing plastic box.<br><br> <b>Warm Tips:</b><br> 1.The refill is initially for B2 B3 ballpoint pens in our company. Search these ASIN for more details: B07TJWG1H5, B07THYVK24 or B07TK1J7BD. Also, you can just input"Nekigoen"on amazon search box.<br><br> 2.The refill is applicable to generic tactical pen and ballpoint pens of other brand like Parker. But you must carefully check the specification of the refill to see if they can match your original pen properly.<br><br> 3.You can remove the spring from the narrow part of the refill, just with a little bit force. When its service life comes to an end, the spring can be reserved as a backup gadget, if necessary.<br><br> <b>Sincere After Sales Service:</b><br> If you have any question or advice about our products,please feel free to contact us.