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. We use thick gauge tinned copper wire to protect from salt and rusting due to high salt content on deep sea trips. OCEAN SALT WATERPROOF - Our thick pvc jacket is waterproof and able to be used for salt water protection. Use for marine speakers, loudspeakers, or marine tower speakers for long lasting and durable waterproof speaker wire jackets. THICK MARINE GAUGE WIRE - Tinned Wire 99.9% Oxygen Free Copper 2 Conductors (2C) with Red-Black internal cable color for easy polarity identification. External pvc jacket color is white cable lining. Insulation resists salt water, battery acid, oil, gasoline, heat, abrasion, and UV resistant radiation. MARINE GRADE INSULATED CABLE - Perfect for radio, automotive, auto trailer, stereo, lighting, r/c under harsh outdoor conditions. UL Listed and CL3 Rated certification for marine wire install. Our pure copper marine cable can support up to 105 C (221 F) Dry and 75 C (167 F) Wet conditions FOR MARINE BOAT SPEAKERS, BOAT CABLE - Our GearIT boat wire cable comes in 25ft, 50ft, 100ft, 125ft, 150ft, 200ft lengths and black colored trailer wire. Search on Amazon for “GearIT 10 AWG Marine Speaker Cables” to find all our 10 ga marine speaker wires. All GearIT marine boat speaker copper wires come with a limited lifetime warranty.