This 500 Amp Jumper Cable Kit includes 30' cables with a 5' truck harness. Clamps have protective coated steel with ergonomically designed handles. Heavy 4 gauge conductors are made with 100% copper wire. There is a built in Polarity Indicator. When the green indicator light is on the cables are properly connected. If the indicator is not lit, check for proper connection. All mounting hardware and instructions are included.