The L16 Stereo Audio Cable with 1/8" TRS Connectors from FiiO utilizes PCOCC-A cable from Furukawa Electric. Features 3.5mm Stereo Sound Straight Plug Gold plated Copper HPC-23TN Oyaide branded, all Japanese interconnect Utilizing PCOCC-A cable from Furukawa Electric Cable: Pure PCOCC-A single core copper PCOCC-A PCCOCC: It's a high purity copper wire which is generated by the OCC after smelting PCCOCC-A (A refers to Anneal): Formed by the PCCOCC after the annealing process PCCOCC-A is a high purity OCC Copper after the annealing process, which is characterized by high purity, great conductivity, soft wire and long usage time.