Black Star Dragon Ball

The Black Star Dragon Balls, are a more powerful version of the main Dragon Balls, created by the Nameless Namekian (before Kami and King Piccolo split). 
The Black Star Dragon Balls are apparently the same size as the Earth Dragon Balls, approximately 7.5 cm in diameter. They can summon Ultimate Shenron who can grant any wishes, including killing people (which the original Shenron cannot).