ADJUSTABLE LENGTH — This chain is designed to easily adjust in length, but provides a firm seal that will not slide out of place over time. The maximum length is 30 inches. PURE 925 STERLING SILVER — Crafted to stand the test of time. Sterling Silver is 92.5% silver, mixed with alloys to add strength and durability. QUALITY — All jewelry is new and inspected for quality assurance. All our silver jewelry is crafted from .925 silver also commonly referred to as sterling silver. It is 92.5% pure silver, mixed with alloys to add strength and durability.