This is a riser for the right control stick of the Nacon Revolution Pro Controller, it should also work for the Revolution Pro 2 since they appear to use the same sticks but I can't confirm that 100% as I don't own a Pro 2 controller.
Adds about 10mm of rise to the control stick. If you want something else, let me know and I'll rise/lower the rise for you and upload it here.
It's a friction fit and as such does not work on the smaller control stick on the left. This is only for the right stick.