These control sticks are exact replicas of those that come with the DJI FPV Remote Controller 2.
They are designed to be detachable and can be easily packed away within the specific compartment upon the remote's handle.
For commercial drone pilots and professional aerial photographers/videographers, keeping a spare pair of control sticks within your FPV drone gear could be a real saving grace.
They are textured for improved grip and more accurate control.