KnuKonceptz Kolossus Flex Kable 4 Gauge Power Wire Black OFC (sold in 5 foot increments) Sold in 5 foot increments - enter the length as quantity ( 1 unit = 5 feet, 3 units = 15' ) 2058 Strands of Tinned Oxygen Free Copper Application includes Auto, Truck and Marine. Ultra Flex Black PVC <span class="a-text-bold">Core Material: </span> 36 Gauge Tinned Oxygen Free Copper - 2058 Strands <span class="a-text-bold">Length: </span> Available in various length <span class="a-text-bold">Dielectric: </span> Ultra Flex PVC <span class="a-text-bold">Outer Diameter: </span>11mm <span class="a-text-bold">Core Diameter: </span>8mm (estimated) <span class="a-text-bold">Max Load: </span>150A @ 20&#039; <span class="a-text-bold">Max Load (amps</span>) Using American Wire Gauge standards, the gauge of stranded wire is determined by the total area of the conductor. To calculate this you would take the area of each strand and add it together. This area, in square mm, then determines gauge. Diameter is not as critical with stranded wire, this is due to the tiny air gaps between each strand. Diameter may fluctuate with strand size and how tightly wound the rope of the cable is. The smaller the number, the larger the wire, until you reach zero or aught (0 or 1/0). From zero, you then have double aught (00 or 2/0), three aught (000 or 3/0) ... Based on AWG, the true gauge of this cable is #4 When bare copper is exposed to oxygen, it oxidizes over time (turns brown/green). These contaminents are damaging to the cable&#039;s ability to conduct electricity. Tin provides a protective barrier from oxygen to the bare copper underneath. By adding a thin layer of tin to each strand, the cable is no longer able to oxidize. Tin does not react with oxygen and therefore the cable will never change color or have any change in its ability to conduct electricity