The high quality copper wire has a black outer sheath is very soft and protects the wire from abrasion and is resistant to the effects of sunlight and chemicals.Rated to work at temperatures up to 80°C/176°F. 16 strands of 0.254 copper wire in each circuit for superior electrical conductivity High purity oxygen-free copper has excellent electrical conductivity.It has lower resistance and higher conductivity than aluminum materials. Widely used in various low-voltage electronics wiring,it can be used for solar panels DC circuits,boats,automobiles,LED and inverter wiring,etc. 18/3 wire has the characteristics of high conductivity,low resistance,soft,and can be twisted and extended at will Easy to peel and cut.and suitable for low voltage (5V-110-300V) installations. Electrical wire come in simple packaging to ensure you get a high quality product at an affordable price,if you have any questions please contact us and well be happy to resolve any issues!