Ultra flexible oil, water and UV resistant sheathing. 100% Tin plated copper conductor resists corrosion from salt and moisture. Solid rubber-filled (not paper or twine) insulator jacket resists capillary action from moisture. For wire run lengths of up to 25 feet, use minimum 12 gauge wire. For runs of 25 to 40 feet, use 10 gauge wire. Manufactured from Heavy Duty annealed, tinned copper, providing maximum current flow. Ultra-flexible for extra protection from vibration or frequent flexing. CSA and UL approved, RoHA compliant.