Most metallic frames are made of materials such as stainless ,Titanium & monel . All metallic frames are prone to corrosion depending on the weather conditions and usage , however most branded metallic frames come with a one year warranty for corrosion and manufacturing defects. Metallic frames can be made in all kind of colours and are very stylish . Titanium frames are very light weight and strong and are more popular in rimless frames , However these frames cannot be mended once broken.