Anodized aluminum is our most popular material, especially when durability is critical. These property ID labels are made from high quality .003" and .005" Lustre-Cal anodized aluminum with the colors and graphics permanently etched into the surface. This material is recommended for labels requiring extreme environmental durability (exposure to direct sunlight, salt spray, high temperatures, cleaning solvents, or continuous abrasion), and is suitable for indoor and outdoor applications. It will not crack, chip, or peel over its useful life. Please request samples to test on your application.