Never worry about running out of ink with these Ballpoint Pen Refills Medium sized. This refill pack comes with the option of blue or black ink, depending on preference. It also comes in a medium or fine point option. These black pen refills are compatible with cross standard ballpoint pens. It is durable. These cross pen refills are suitable for any general purpose writing tasks. The refill product can also be utilized with many different types of paper. This value pack comes with two barrel refills. The refills are easy to use, simply remove the pen cap and slip the refill inside.