Extra Heavy Duty 4 gauge booster cables are suitable for starting all passenger vehicles and light trucks. 250 percent more power than 10 Gauge cables. The UL listing insures that these cables meet or exceed Underwriter Laboratory's strict manufacturing and safety standards. The 20 foot length allows passenger vehicles to be parked front to back. Polar-Glo clamps glow in the dark to insure correct connection to battery terminals. Complete jump starting instructions printed on the carton. Made in the USA. Limited Lifetime Warranty.