Spins and rotates just like Hermione's necklace br Features a real, working hourglass br Perfect for HP fans br Diameter - 4cm 1.57in with 17 inch chain br Show off your fandom with this gorgeous, HP-inspired necklace! br br br P.S. - Will not help you attend more classes than time will allow. (Unless you can encase it with an hour-reversal charm.