this works extremely well my other back was very dirty and needed a new one this one fit perfectly and can customize. If you dont know how to put on 

1. Pry off the black plastic trim from the bottom handles and around the thumbsticks.
2. Pop out the L1 and R1 shoulder buttons by prying underneath them.
3. Unscrew the 2 screws exposed under the L1 and R1 buttons.
4. Unscrew the 2 screws exposed at the bottom tips of the handles.
5. Unlatch the 2 plastic clips near the headphone jack.
6. Pull the back shell up and off the controller.