Stipula presents the latest design in technology and creativity in the new La 91 cap less fountain pen. The La 91 innovation is compacted with its 91 millimeter structure: simply sliding the silver-finished and engraved ring along the channel carved in the barrel releases the half-moon opening and propels the unique, large-sized 14k gold nib from the end of the pen.. Although its frame is small and unencumbered, the ink capacity of the pen cartridge system is consistent with that of the standard-capacity cartridges available in other Stipula pens. Materials: Resin. Filling system: Cartridge