20 inches in length and a solid sterling silver chain. (Not hollow) The chain weighs 16.3 grams .Ideal chain for a pendant or just worn by itself. Chain is 4 mm wide .
Good way to get a measure on size chain needed is to know the shirt size. Size small is a 14 inch neck size . Size medium shirt is 15 1/2 inch neck . Use that as a buying guideline for length.