The Baller will travel in any direction, shifting and moving with the player as you change your camera angle. When operating a Baller, you can use its Boost function to quickly propel yourself at an object, causing it damage, or you can use the Grappler to tether yourself to a stationary object and move in circles around it.

Ballers can also be used in the Screwballer, which is a rollercoaster-lie structure players can ride on.

Source: https://www.distractify.com/p/where-are-ballers-fortnite