About This Pen: This Montblanc Boheme Rouge M25100 Pen has a cartridge fountain pen writing system. It features a black precious resin barrel, complimented by a black precious resin cap, and a synthetic ruby-colored gemstone on the clip. The three yellow gold-plated rings on the trim is embossed with the Montblanc brand name. The nib is made out of 14K gold with rhodium-plated inlay and is hand-crafted by Montblanc. The following Nib Width are available: Identification No. Nib Widths 03664 F 03665 M "