It's even more important to carry jumper cables on your boat than in your car. These jumper cables are big on charging power: 200 amps. The 8-gauge wire is tinned for salt water use and is heavily insulated. The extra long 20 ft. length provides enough reach for marine conditions. Stow them in the convenient snap storage case provided. These cables feature rust-free clamps with extra long vinyl grips to prevent shorting. Don't leave the dock without these cables!