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"Manufactured with ultra-flexible Power-Flex Cable\r\n \t100% fine stranded PURE COPPER cable for high amperage applications\r\n \tCopper cable lugs are tinned coated and utilize a closed end design for corrosion protection.\r\n \tPolyolefin glue-lined heat shrink tubing applied to form a protective seal.\r\n \tIncludes one black cable and one red cable. Simply select cable length and cable lug mounting hole diameter for cable ends.\r\n \tCables are USA-made in house utilizing a 6-point, 16 ton hydraulic press.  Custom cables of any size available upon request.\r\n \tAlso available in: 6AWG, 2AWG, 1/0 AWG, 2/0 AWG, 4/0 AWG\r\n \tJumpers also available in single quantities: 4 AWG, 2 AWG, 1/0 AWG, 2/0 AWG, 4/0 AWG"
<https://www.currentconnected.com/product/bc-i-4awg/>