magnetic olive beads become more and more popular in the world for playing by adults and children. they think it is a great sport, will help to improve people's reaction capability of muscle, relief stress and bring players a happy mood. this olive shaped hematite possesses high power magnetic. it is sold in pairs. people must throw one in the air and it joins with the second, will make buzzer(sounds like from bees). if you find this item interesting, pls do not hesitate to let us know. we would be pleased to supply further details on request or to discuss your requirements without obligation. look forward to your call. homer huang ciyi electronics co.,ltd