EFYTAL Personalized Sterling Silver Two Name Necklace On Disc with Birth Month Charm with 2 or More Names Specify the customized names, birth month charm, and chain length in the 'Gift Message' field at checkout (must select this is a gift first) Materials: Sterling Silver Disc Size: 15.9mm (5/8") Chain: 16" or 18". The chain is dainty but strong, and will not break. Efy Tal Jewelry (manufacturer) will always replace it for you if needed. EFYTAL guarantees your satisfaction. 5 year warranty on chain.