Mirror Disco Ball. 70s Disco ball is made of polystyrene foam with square mirror pieces covering it. Ball measures 15cm in diameter and has a loop for hanging. Create some disco party fever at your next 70's party with this sparkling disco ball - hang from the ceiling to create a dazzling discothèque party setting! Disco ball comes boxed and would make an ideal prize or gift for your disco dancing buddies. Ball is not motorised so will not consistently rotate. Please be aware due to the shape of the Mirror Balls a small amount of foam can be seen.