Exploding Sphere

A ninja tool stored in Tenten's large scroll. It's a metal sphere with kunai welded into it, which also has a hidden explosive tag that causes it to explode upon contact, sending out kunai and fragments of the sphere as shrapnel.

Trivia

 * This tool's name was established in the game Naruto Shippūden: Ultimate Ninja Storm 2, as it was unnamed in both anime and manga.