From D'Addario:

D'Addario Custom Series Cables utilize ultra-pure, Twisted pair, oxygen-free copper conductors for low capacitance and pure tone. Encapsulated and impenetrable soldering points with double-molded strain relief provide maximum durability and worry-free reliability. Two layers of shielding provide 100% coverage for superior noise rejection noise rejection and minimal handling noise, making this a superior, high-performance cable.