Windshield material: Sapphire glass (internal irreflection coating). Clasp: One push diver adjuster method. Case material: Edge stainless steel (hard coating) Body stainless steel Back lid stainless steel. Case diameter / width: 5.1cm. Band Material / Type: Stainless Steel. All our items are 100% authentic. Depending on the products, the proper transformer and adaptor are required to use them in your local country, where the voltage is higher than 100V such as 200V-240V. We are not responsible for the damage of this device if you use it without them. Therefore, we will open ...