They are available in a range of 16", 18", 20", 22" 24", and 28" size chains. (40.64 cm, 45.72 cm, 50.8 cm, 55.88 cm, 60.96 cm)*Please note that the chain sizes are cut and measured out from end to end (the circumference), and not from end to center. This is the standard for listing jewelry sizing. Here is a necklace chain sizing chart: