♦ The Model 31 encompasses features from several F-C models. The grip section is like that of the 40 Panther, the silhouette is a slightly slimmer version of the 19, precision posting like the 20, 45, and 03, cut grooves and recessed nib like the 20. ♦ Dimensions:.625" cap diameter (15.87mm).531" upper barrel diameter (13.49mm)5.50" capped length (139mm)6.755" cap posted length including nib (172mm)5.250" barrel length including nib (133mm).42" grip section at thinnest point (10.67mm)Weight without ink = .92 oz / 26.08g ♦ Made in USA of long lasting, durable hard acrylic that is light weight. ♦ Standard Int'l Cartridge / Converter filled, one of each included. Also can be used as an eyedropper. ♦ #6 Size nib - with many tip options in factory or custom ground. ♦ Lifetime Warranty. ♦ In lieu of a traditional gift box we ship with a Franklin-Christoph single pen zippered pouch with an outer white thin box.