BG247 Floating Locket Chain (Over The Neck Extended Chain (Gunmetal)) Each chain made of stainless steel. Compared to sterling silver, stainless steel does not tarnish and is resistant to most harsh chemicals. The over the neck chain style is approximately 40", and it's chain style is a thin rolo chain. The toggle neck chain is approximately 16", and its chain style is a thick rolo chain. Each necklace has a lobster claw clasp to attach your floating locket to.