Features: Manual, Stainless Steel or Carbon Steel or High Carbon Steel, Stainless Steel" or "Aluminum" or any other specific material from the example_valid_values list based on the manufacturer's typical material choices or the product's expected properties. The specific material chosen should be justified in the 'reason' field. [Note: The 'value' field should contain only one material, even if the product is made of multiple materials, as the 'reason' field explains.], false