The cable is made of copper-clad aluminum cable. The core of the aluminum wire is coated with a layer of copper.
Schumacher Jumper Cables, Copper Clad, 20ft.L, 4-Gauge, 250 CA, Model# BC4

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- 250 Amp power
- Pressure-crimped connections provide low resistance and top performance
- Contoured copper-plated jaws can be used with top- or side- terminal batteries for best conductivity and power transfer
- Terminal-biting clamp design has a heavy-duty spring to provide a vise-like hold
- Vinyl coating protects against rust and corrosion
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