This new General Motors tank is made of our famous military grade, cross-linked polymer (XLHDPE). It's at least 1/4" thick and built to outlast all competitors. It's tougher than steel and more durable than aluminum. Like all fine TITAN products, this new design has undergone extensive testing. Our legendary products are so tough and well-proven that we back them with a Lifetime Warranty! No cutting, drilling or fabrication required for installation.