I got this kit along with my Rockford R500-1 amp, and I also bought a second kit to supplement this one, but I ended up using this kits power and ground cables. They are of good build, while they probably aren't true 4 gauge, they do the job fine. The RCA's are not good quality, they were already corroding slightly when i took them out of the packaging! Other than that, this kit isn't bad.