Titanium is as strong as steel, but as light as aluminum. It does not corrode, does not tarnish, and in its pure state, is totally non-allergenic. It does not react to sunlight, salt-water, or any body chemistry. It can be anodized to be a rainbow of colors. Grades 1-4 of Titanium are pure titanium. Lower grades (higher numbers) are alloys with other metals.