Core OFC Oxygen Free Copper OFC Oxygen Free Copper CCA Copper Clad Aluminum OFC Oxygen Free Copper OFC Oxygen Free Copper Tinned OFC Oxygen Free Copper. MARINE TINNED COPPER WIRE (OFC) - Our GearIT Marine Speaker Wire made of tinned copper is designed to withstand harsh outdoor conditions, specifically for ocean or beach side properties and deep sea ocean adventures.
eBay