The TWSBI Vac700R fountain pen features a modern, eye-catching design with a clear demonstrator body that shows off the pen's inner workings. It comes with a vacuum filler mechanism, which can be easily operated by twisting the knob at the end of the barrel counter-clockwise, pulling back the plunger, then submerging the nib in ink and pushing down the plunger to create a vacuum that sucks the ink up into the barrel. Thus there is no need for a converter or ink cartridge!