End cap or dobb made of high quality surgical steel, the strap is glued to the ends.
316L steel or surgical steel as it is also called contains about 10-14% nickel, but as the nickel in the steel is tightly bound in the metal, only less than 0.1 millionth of a gram of nickel is released per cm2 and week.
This means that 316L complies with the EU directive for products that come into close and prolonged contact with the skin. The limit value is 0.5 millionth of a gram per cm2 per week. Nickel allergy sufferers usually cope well with the steel, but if you are extremely sensitive or worried, we recommend titanium or similar products.