AlphaAcc Pack of 50 Stainless Steel 30 Inch Military Ball Chain Necklace Pack of 50 Stainless Steel ball chain necklace (30 inch),Ball size 2.4mm STAINLESS STEEL, Never fade or rust! Even you can wear it while showering. Hypoallergenic! Doesn't cause allergic reactions like products containing nickel. This is a great item to using on a lot of things,Perfect for dog tags, bottle cap pendant necklaces, scrabble tile pendant necklaces, and many other use Well made and strong. They are easy to adjust the length to whatever you prefer.