Telekinetic Balls are balls of extreme kinetic energy capable of crushing one and sending them flying. This ability is an extension of Telekinesis which makes it quite rare.
During Season Nine, Prue developed this ability which she uses a couple of times. Her ability is extremely powerful, she was able to destroy the kitchen and crush Piper with only one ball. It was not powerful enough however to prevent Wyatt from diverting it. One of Prue's most popular uses of this ability was when she sent a ball at one of the Collector's that sent him flying through and into the window.