Kaweco Classic Sport Fountain Pen, Black, Twin Bock Calligraphy Nib The Kaweco Sport closely follows an original 1935 Kaweco octogonal design Compact size feels just right in your hand, 4.1" long (104mm) closed, 5.2" long (132mm) open, and slightly over 1/2" in diameter (14mm) The cap screws securely on to close the pen and protect your pocket and the nib Utilizes the standard international size mini ink cartridge Made in Germany