Human Bullet Tank

After the user uses Multi-Size Technique to make themselves into a human-sized ball, they tuck their limbs inside their clothes and use chakra to propel themselves into a powerful, but usually slow, roll. It is difficult for the user to turn in this form. This technique also plugs 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.