Naruto wear the necklaces that Tsunade gave it to him.First,she gave it to Nawaka,her little brother,then he died.After that,she gave it to Dan,her lover and then he died too.They said that the necklaces don't except anyone but her.And when Jiraiya and Naruto went to find Tsunade to make her the next Hokage,she and Naruto bet that if he can learn how to use Rasengan in 1 week,she will gave him the necklaces,and he ươn the bet.Actually that necklaces belongs to Hashirama!
