Dark Room Emulsion acrylic combined with black. 

♦ The Model 55 Pentium fountain pen features a #5 nib in an efficiently designed silhouette. Distinctly Franklin-Christoph, with beveled ends, the signature clip and softened simple features. Light weight and balanced when posting, the 55 is a good choice for long writing sessions....

♦ Triple filling options - cartridge / converter / eye dropper. Cartridges and converter are included. Barrel holds approximately 3.1ml of ink when eyedroppered.

♦ Made in USA.

♦ Lifetime warranty.

♦ Included is a zippered pouch. 

♦ Dimensions:

.562" cap diameter
.500 upper barrel diameter
.438 lower barrel diameter
5.25" capped length
6.13" cap posted length (including nib)
4.88" barrel length (including nib)
.383" curved grip section at thinnest point

Weight: .66oz (18.62grams)