This chain link necklace measures 30 Inches from end to end when open. There are 40 metal clam shells that dangling from chain. Each one has a white glass bead ( faux pearl). The detail to each shell makes this a very attractive necklace and also makes a wonderful sound as you move. This roll clasp closure is very secure. Such a shame there is no makers mark as this is truly a lovely piece to be proud of.