This 18th birthday necklace comes with a key charm and message card with the words "Happy 18th Birthday, have a wonderful day" there's a space for you to write a little note or it can also be left blank. Chain Length: Sterling Silver 16 inches (40.5cm) or 18 inches (46cm) Key- 15mm Silver Plated Delivered on a message card & in a black gift box Letter box friendly gift - fits through a standard size letter box