All metals are scratch resistant and non-tarnishing.Titanium for instance is slightly darker than stainless steel but astonishingly light, while tungsten carbide is the hardest metal used in the range.Inlays of gold, silver, rubber or carbon fibre and even diamonds go together in unity with the stylish designs.Size Guide57mm Diameter = Small62mm Diameter = Medium67mm Diameter = LargeEach product s