The refill in your pen main is the main source of writing pleasure. To that end, we have engineered our ballpoint pens to take one of three different technologies; GEL and Liquid ink as well as a traditional standard oil based. This allows you to choose exactly the line you want in the precise color and point size you desire. When selecting additional refills, take your time, as you have an amazing amount of choices. All of which will fit perfectly into your APC Independence twist-top ballpoint pen or our indestructible Minimalist ballpoint. Let’s start filling that pencil cup!