These unique professional Audio cables are originally designed to deliver maximum performance for wiring the speakers in home or office to your receiver. Copper wire provided the optimal conductivity/low resistance to drive high quality audio to your speakers. CONSTRUCTION: Conductor: Stranded bare copper wire Insulation: 2 cores, PVC, blue & red Laying: Filler between the cores Shielding: Non-woven fabric screen Outer Jacket: PVC, Matt, black Working temperature: -20℃ to +70℃ Spark Test: 2000V Cross Section Conductor Conductor Resistance Insulation Outer jacket 1.5mm² 30×0.25±0.01mm 12.5Ω/km 2.4±0.15mm 7.0±0.3mm 2.0mm² 41×0.25±0.01mm 9.5Ω/km 3.0±0.15mm 8.4±0.3mm 2.5mm² 51×0.25±0.01mm 7.2Ω/km 3.4±0.15mm 9.3±0.5mm