Best light reflective materials such as Al and Cr. Using it directly as a metal oxidizes with time and the reflectivity decreases. In order to increase the durability, use aluminum-coated glass and a protective layer against oxidation. Chromium also has good reflectivity but is weaker. It does not oxidize as fast as aluminum but still has anti-scratch and anti-scratch protective coatings.

With respect

Thank you very much dear Yankov for providing me the valuable information.

Al is better because is a good light reflective material, and also is a cheaper material too.