These cool bullet buttons and thumbsticks are perfect for Xbox 360 gamers who want to personalize their controllers. Made from high - grade aluminum alloy metal, they feature 9MM and 30 Caliber bullet casing designs. They fit official Microsoft Xbox 360 controllers. While installation requires opening the controller (medium technical difficulty) and a T8 screwdriver (not included), it's worth it for the unique look and durability. Order before 4pm for same day shipping.