Rz Guanqin Men Automatic Mechanical Watch Hollow Engraving 100m Waterproof Luminous Tourbillon Sapphire Crystal Stainless Steel 40mm Watches for Male (Silver White Blue) Water-resistant to 100m High hardness sapphire crystal, high temperature resistance and super anti-corrosion. Automatic Mechanical Movement Luminous men hollow tourbillon watches Case and bracelet are made of stainless steel