Each set of 3 GNUs ships with 3 units of PVC coated metal cables with barrel screw connector ends for ease of attaching to bags, keychains and so on.
Credits
- GNU Design – By Marius Kruger
Source: https://www.thingiverse.com/thing:146180
License: GNU GPLv2 - Carbiner Design
Source: https://www.thingiverse.com/thing:489709
License: Creative Commons – Attribution – Share Alike (CC-BY-SA)