The titanium used in all Edward Mirell jewelry and accessories is lightweight, completely hypoallergenic, corrosion and scratch resistant and can be engraved. It does not react to salt water, sunlight, or any body or common chemistry. All Jewelry items are made with Spectore Brand Titanium, consisting of 99% (commercially pure) titanium, grades 1 and 2 titanium. These were selected for their balance of high purity, bio-compatibility, and strength.