Constructed with premium vinyl insulation that is rated at 600V, 1050C dry and 750C wet, stays flexible even in extreme cold (-400F/C) and resists salt water, battery acid, oil, gasoline, heat, abrasion and ultra-violet radiation. High quality ultra flexible (Type 3) tinned copper stranding provides maximum protection against corrosion and electrolysis while resisting fatigue due to vibration and flexing. 250' spool.