This is RS485 signal transmission line, made of pure Cu (copper) which is of excellent quality. Little signal attenuation, it has better performance compared with other signal lines which is made of twisted synthetic brass wires.
Of widely use, it can be accessory for devices support RS485 function.
Moreover, it can be customized. If you need one longer than 10 meters, the extra length (above 10 meters), it costs USD 1.2 per meter. For example, if you need a 12m line, it would cost you USD 14.9 (10m line: USD 12.5 + extra 2 meters: USD 1.2*2)