MATTE TIN PLATING: Butt Splice Connectors are made of high-quality C11000 electrolytic copper with special matte tinned process. (6 Gauge 6PCS, 8 Gauge 20PCS, 12-10 Gauge 44PCS, 14-12 Gauge 60PCS, 16-14 Gauge 60PCS, 22-16 Gauge 60PCS, 26-22 Gauge 70PCS). Leia Mais