Crafted by blending copper flake, aluminum, zinc and graphite into a high quality soap thicken lithium complex grease, Ultra Shield™ is extremely resistant to corrosion. Copper flakes form plates, providing separation between surfaces, which shield these surfaces from galvanic attack by sacrificing the metals in the anti-seize, and preserving the equipment being protected. Ultra Shield™ is aptly named. It delivers ultra performance by being loaded with more copper than anything we have tested. Copper is the most expensive and important component in a regular anti-seize. Copper flakes bear most of the burden of “plating-out” and keeping the surfaces separated, especially in high temperature applications.