Droideka
Droidekas (also known as Destroyer droids) are a model of tripedal military droid fielded by the Trade Federation and later, the CIS. Of Colicoid manufacture, droidekas provide heavy weapons support for droid infantry.
Features
While droidekas do not walk very fast, they can move quickly by curling up into a ball and rolling, enable them to redeploy rapidly on the battlefied. Some models carry shielding capable of resisting blaster small arms. They are armed with two double-barrelled, automatic blasters, making them powerful anti-infantry units that were even a threat to Jedi. Their high cost, however, limited their production. They saw service during the Battle of Naboo and during the Clone Wars, but -- like the rest of the Confederacy's droid armies -- were de-activated at the Clone Wars' end.