1.black and red speaker cable 2.4, 6, 8, 10, 12, 14, 16, ... is composed of bare of tinned twisted copper wires and each of the conductors with PVC insulation layer ... the transparent protective cover of PVC (Red of Black). This type of cable is applicable to acoustic equipment.specification:Item ... /roll or 305m/roll100m/plastic spool or 305m/plastic spoolRed/black speaker cable, 4, 6, 8, 10, 12, 14, 16, ...