Rz Guanqin Waterproof Ceramic Luminous Men Sport Hollow Automatic Self-winding Crystal Tourbillon Watch Imported Water-resistant to 100m High hardness sapphire crystal, high temperature resistance and super anti-corrosion. Imported Swiss Automatic Mechanical Self-winding Movement Luminous/calendar/week/month and tourbillon men sports hollow engraving watches Case is made of stainless steel and bracelet is made of ceramic