HIGHLY CONDUCTIVE: NAOEVO electrical wire uses high-precision oxygen-free tinned copper, The outside diameter of the Jacket is 3.5 mm Typ, and 41 strands of 0.24 mm tinned copper wire are inside each circuit, has lower resistance and higher conductivity PRODUCT SPECIFICATION: 14 AWG wire waterproof level: IP68. Rated voltage: 600V(also can for 5V 12V 24V up to 600V). Rated working temperature up to -22°F/ 221°F. Flame retardant grade: VW-1