Perkeo Calligraphy Set - Blue This Perkeo Calligraphy set is made by the German pen brand Kaweco. The set comes with three changeable nibs all in different sizes: 1.1mm, 1.5mm and 1.9mm. This can give you the scope to experiment with different weights of line in your handwriting or to get really serious with an exploration of what you can achieve with calligraphy. Each nib is a different shade of blue with the lightest blue being the narrowest nib and the darkest blue being the broadest nib. The pen measures just under 16cm from the tip of the nib to the end of the lid (when it is stowed on the non writing end of the pen). The pen lid closes with a firm push. Measurements (set) 17.8cm x 6.5cm x 2.2cm