Rz Guanqin Men Automatic Mechanical Calendar Diamond 100m Waterproof Sapphire Crystal Stainless Steel Case and Leather Strap Silver Black 38mm Wrist Watches Water-resistant to 100m High hardness sapphire crystal, high temperature resistance and super anti-corrosion. Automatic Mechanical Movement Men dress watches Case is made of stainless steel and bracelet is made of stainless steel and leather