Cristal ballpoint pens feature a clear barrel so you can see the available ink supply and a roll-resistant hexagonal barrel for comfortable, controlled writing. The design features a vented cap and a medium brass tip with a tungsten carb ball. The Stick pen offers long-lasting reliability and smooth, written writing with consistent, crisp, effortless lines. Ballpoint pens are not refillable. Package of 10. 8 blue pens, 2 black pens and 1 red pen.