... ROHS ISO9001:2008 certificated 2.2*5.2mm PU Telephone Flat CableConductor: bare copper, tinned copperConductor struction: single strand copper wire/stranded copper ... , brown, purple, etc.Insulation: as your request, we have PU, PP, PVC, etc. availableOuter jacket: as your request, we have PU ... delivery! All material we use are environmental friendly 2.2*5.2mm PU Telephone Flat Cable