Rockford RFK4X 4 AWG Complete Amplifier Install Kit Rockford Fosgate Power Kits feature full AWG (American Wire Gauge) Battery PWR/GND Gauge - 4 AWG. Amplifier PWR/GND Gauge - 4 AWG. Fuse Type - MAXI. Speaker Wire Gauge - 16 AWG. Fuse Size - 100 Amp All brass parts are manufactured using the highest quality of standards All kits include the appropriate wire termination hardware 100% oxygen free copper