6 core cable for phone extension wiring (though 4 core is more common).
Sold per metre, buy as much as you like (up to 100m) and get it all in one big length.
Normally (though not always) the colours are connected as follows :
- Pin 1 - Green with white rings
- Pin 2 - Blue with white rings.
- Pin 3 - Orange with white rings.
- Pin 4 - White with orange rings.
- Pin 5 - White with blue rings.
- Pin 6 - White with green rings