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Many other brands did not measure to 4 gauge like our Rockville wire. They had thick insulation but they were short on the wire. This cable is standard American wire gauge thickness. This is another reason our conductivity is better than anything else at this price point. Other brands in the market place write 4 gauge, but cheat you on the thickness. We are honest about the thickness of our cables. We also tested resistance which is really the only thing that matters. Since Rockville wires are made with around 3 times as much copper as any other wire at this price point, these wires had a much better resistance rating which means they will transfer more power to your amps than the other brands.The Rockville power wire features a new soft abrasion proof insulating jacket. This rugged PVC outer jacket allows for 100% improved flexibility over standard power cables making them extremely easy to route through your vehicles interior, and it maintains exceptional resistance to grease and oil. The PVC outer jacket can with-stand an extreme temperature range of -40 to 220 degrees F.Features:Rockville R4G40-BLUE 4 AWG Gauge 40 Foot Car Amplifier Power Wire SpoolColor : BlueGauge : 4 Gauge (AWG American Wire Gauge Standard)Wire Length : 40 foot (mini spool)Special Winding Configuration Reduces Unwanted Noises and Maximizes Current TransferIncredibly Flexible and Extremely DurableCool cable technologyThick Protective Ultra Soft PVC Translucent JacketBraided Super-Flex Design Ensures Optimum Surface Area and FlexibilityDesigned for Show Car PerformanceUltra-Pure ConductionHigh Current Power CableEliminates Noise from the AC LineShielding From RFI and EMIStranding : 7x7x22x0.15mm (7 Ropes Consisting of 7 Sets of 22 Strands of 0.15mm Wire)Resist Abrasions, Chemicals, and Temperature ExtremesRated at 110°C (Celsius) / 230°F (Fahrenheit)Guaranteed to Make Your Amplifier Run Cooler an