SSA communication wire (Surface Supplied Air). 330 feet (100 M) of 2 wire 16AWG. Core filled and stranded for moisture protection. This gauge of wire, with its stranding provides the optimal resistance for surface to diver communication. Larger wire can be cumbersome and expensive. Smaller wire does not have the ability to transmit clearly. We reduced the size of the wire by removing the 3rd ground wire, which most harvesters remove or cut. Making for a streamlined umbilical system.