Xbox 360 Controller Trigger Pair w/ Built in Trigger Stops for FPS Games Built in trigger stops improve FPS performance Decreases the time it takes to depress trigger Demo video: http://www.youtube.com/watch?v=PTFjkT6dF1w Install video: http://www.youtube.com/watch?v=ZwMYN6k1KOE Installation required (must open up controller to install)