Push pull inner cable also called push pull inner wire is a special upgrade of the steel wires rope.
The rope is just able to manage high tensile loads, the push pull inner cable can also transmit high compressive forces.
In fact it is composed of two parts: the inner steel wire rope and the over wrapped flat wire.
Comparing with the normal steel wires rope, it has high tensile and high compressive strength, but also lower frictional resistance, and high transmission efficiency.