Solid copper

The inner conductor is the heart of the cable and defines the flexibility and conductivity of a cable.  Several different materials and alloys are used to create these conductors, each with their specific applications and advantages. 

The signal cables consist of a solid inner conductor. Typically, you will find solid core wires in situations where the wire is not designed to be continuously flexed and where the wire may be exposed to corrosive elements or adverse weather condition. A solid copper core can achieve an even more compact diameter than a stranded wire with the same current carrying capability.