IWC Watch Pilot Double Chronograph Top Gun Ceratanium IW371815. Ceratanium was developed by IWC and combines the advantages of titanium and ceramic in a single material. Based on a titanium alloy, the patented material is as light and rigid as titanium itself but at the same time as hard, wear free and scratch resistant as ceramic. Other compelling features are its skin friendliness, high corrosion resistance and striking matte black colour. All the case components, including the push buttons and pin buckle, are made of Ceratanium, which means the entire watch has a striking jet black design code. The Double Chronograph features an integrated split seconds function that enables the watch to time two separate actions simultaneously. Its power is supplied by the 79420 calibre movement with automatic winding and a 44 hour power reserve. The watch has a black dial and hands. It is worn on a black rubber strap with a textile inlay.