Titanium is a nickel free, hypoallergenic, totally inert, non-reactive metal. Titanium is one of the best metals for sensitive skin caused by metal allergies. Even when you cannot tolerate silver, gold, platinum or surgical stainless steel. The Titanium I use is Grade-1 which is commonly used in surgical implants in the body. It is very lightweight, but as strong as steel. Titanium has a silver-grey color and doesn’t tarnish.