Fountain or Ink pens as they are referred to offer a clean and smooth writing experience. Unlike the old days, they are easily refilled with an International size disposable cartridge. Many models I make also can use the converter pump to draw the type and color ink desired from a bottle.
Dried Prickly Pear Cactus filled with black acrylic makes this very unique and distinctive pen. Rollerball or Fountain available in Black Titanium metals