RASENGAN Tee

The Rasengan was created by Minato Namikaze, which he based on the Tailed Beast Ball. He spent three years creating the Rasengan, which he intended to be the highest form of shape transformation. Like many of Minato's jutsu, the Rasengan does not require hand seals to perform. Once it is formed, it also does not require any additional chakra to sustain it, which means that there is no definite limit to how long the Rasengan can be maintained. However, the Rasengan will dissipate if it collides with something, even if it's an unintended target. Though the Rasengan's shape is consistent from user to user, its size varies from only barely large enough to be noticeable to much larger than the user's hand. With greater experience with the Rasengan comes a larger size.

Jiraiya describes the Rasengan as stronger than the Chidori, a statement that Sasuke Uchiha concurs with after comparing the damage caused by the two attacks. On contact, the Rasengan grinds into its target, propels them along the Rasengan's trajectory - either away from the user or into the ground beneath them - and at some point bursts, causing severe damage at the point of contact.