From D'Addario:

Ordinary speaker cables can adversely affect your tone, robbing you of harmonic content and sonic detail. Benefiting from years of research, D’Addario Classic Series Cables provide uncompromised quality and tone at an affordable price. Utilizing the latest in cable manufacturing technology, the Classic Series Speaker Cable features 16AWG stranded copper conductors and single-molded strain relief for maximum signal transfer,flexibility and worry-free reliability.