Different BONOSS lug nuts have different rust and corrosion resistance due to different materials and processes. Forged 7075T6 aluminum alloy wheel nuts usually use oxidation coloring process, with many beautiful and bright colors, but it has disadvantage to strong alkaline environment, when it stay in strong alkaline environment, it will appear fade and color corrosion. The titanium alloy wheel nut uses a special coloring process, and the overall rust and corrosion resistance is more prominent. High-strength alloy steels are generally coated with rust-proofing, which is more rust-resistant, but it has only few colors. Detailed test report of TUV, please see attached as follow.