Human Bullet Tank

A threatening taijutsu trick that converts the users large frame into a destructive weapon. The user first uses Multi-Size Technique to make themselves into a human-sized ball (though more skilled users can apparently do it without the need of using the Multi-Size Technique first), then they tuck in their limbs and use chakra to propel themselves into a powerful roll. Its effective use of weight and the force of rotation make for an even greater lethality than appearances would let on, enough to pulverise someone's hand with but a mere touch. It is difficult for the user to turn in this form. This technique has the added effect of plugging up the user's ears.

Trivia

 * Nagare at some point saw this technique being used and copied it, creating the Assimilated Rock Tank technique.
 * The full name of this technique is.