VS Panerai 719 titanium case. Titanium has been awarded the title of "21st century metal". Titanium's specific gravity is only half of iron, but it can withstand hammering and drawing like copper. In the ultra-low temperature world, titanium will become harder and have the properties of a superconductor, while steel will become brittle and incompetent. Titanium also has a particularly high hat called "biophilic metal". It is undoubtedly the first choice for people who are prone to skin allergies.