This is because they are handmade and that small air bubbles can occur during production

First you glue the substrate

Take some care when writing

The material is leather and metal

Say hello to Billy the Duck in the Wildlife series from Dingbats

EnerGel Rollerballpenna - Sterling - Guld Craftlines This is because they areEnerGel Rollerball Pen Sterling Gold from Pentel. The pen has a metal body with grooves to provide a good grip when writing. It is water based gel ink. EnergGel with a ball diameter of 0. 7 mm has a line width of 0. 35 mm. Initially, the pen has a cartridge with black gel ink. However, it is compatible with the EnerGel LR7 refills which are available in a wide range of different colors. LRN5 is a refill with a thinner line width.