For transmitting the optical digital audio signal, e.g. from a CD player to an amplifier, extra thick single protection with robust sheathing made of reinforced high-tech material for protecting and shielding the optical fibre, crystal Clear Material for very high data transfer rates, 24K hard gold-plated plug, optical fibre tip for a snug channel stopper connection, extra thick single protection, CCM-Crystal Clear Material, HRA-High Resolution Audio, 30 year warranty