5 Meters 12 AWG Solar Panel Extension Cable with MC4 Female and Male Connectors Adapter Kit (5m Red + 5m Black) is a high-quality product specifically designed to provide professional solar panel installation for both on-grid and off-grid systems. Minimal Power Loss: Solar extension cable is typically sold in 14, 12, and 10 AWG sizes. The solar cable offered in this listing is 12 AWG and it has one of the two larger sizes. Using a large diameter cable minimizes power loss in your solar panel system. Two cables with MC4 connectors on one end connecting to the solar panel and stripped on the other end connecting to the solar charge controller. The cable is weatherproof and designed to withstand extreme heat and cold. Material: Copper for better connectivity.