After market replacement set of black PlayStation style thumb sticks with the rounded mushroom top. These fit either a wired or wireless 360 controller or a PS2/3 controller for that matter. These are the ones the llamma uses on his personal controller, just something about the round top surface that works for me. I find I have to re-grab the stock thumbstick stealing precious moments that I could be using to aim. We used to have ones that were hard to put on the sticks but these are the updated Revision 2 that fit on nice and easy!