These are 8-conductor cables with RJ-45 connectors, commonly used for networking and known as 'Category 5' cables. In Vesta installations, they're used to connect the Vesta controller to discrete input and output hardware.
We offer these cables in a variety of lengths in the Vesta standard colors: Green for discrete inputs and Blue for discrete outputs. You can order these cables by simply specifying the color and length. On our invoice, you will see our part numbers in the form 'CBL-CAT5-color-length' where color is either 'BLU' or 'GRN' and length is three digits. For instance, a 10' blue cable is CBL-CAT5-BLU-010.