Repulsor balls functioned as small, easily controlled spheres that generated an antigravity field and were employed as projectile weapons.
These spheres possessed the capability to surpass the velocity of a rapidly moving vehicle, achieving speeds exceeding 250 kilometers per hour, thus establishing them as among the most lethal armaments within the Galaxy's arsenal. Upon nearing their intended target to within approximately one meter, the repulsor balls would explode.
These particular weapons achieved their greatest notoriety through their utilization as the primary armament of the Fromm Tower Droids, which were under the ownership of the criminal organization known as the Fromm Gang during the year 15 BBY.