iConnects Pure Flow Tinned Copper is 100% Pure Copper that is coated in a thin layer of tin to protect the copper from corrosion that would decrease the wire’s efficiency in humid, wet, and high-heat environments, such as the engine bay, doors, and trunks. All of iConnects’ Pro Series Speaker and Power cable are made from our oxygen-free Pure Flow Tinned Copper wire that can last up to 10 times longer than its non-tinned counterpart.