The TWSBI Vac Mini is a pocket size fountain pen, the smaller sibling of the Vac700R. The compact design allows for the cap to be posted on the back of the pen while writing. Like the Vac700R, the TWSBI Mini has a vacuum-filing system and can be disassembled using the included wrench. This small but mighty fountain pen features a clear acrylic body. Its vacuum filling system provides a large ink capacity for such a small pen, and the clear body allows you to view the level of ink remaining at all times.