The Jaeger-LeCoultre JL Master ultra-thin series watch has a diameter of 40 mm (simultaneously authentic) and uses imported 9015 automatic winding movement to keep accurate time and full reliability. The case material is 316L stainless steel, the front and rear of the watch mirror are made of sapphire crystal glass, and the dial is made of radial Brushed rhodium-plated polished. Italian cowhide with tapered hour markers and original buckle. The steel strap perfectly matches the lugs and is waterproof to a depth of 50 meters.