Voboo Thumb Stick Grip Cap Cover for Sony Playstation 4 Controller-black High quality silicone thumb stick grip cap cover for PS4 Controllers. These thumbstick grips are must for any gamer to ensure your thumbs do not slip during gameplay. Easy to install - just turn the caps inside-out and then pop over the sticks. Enhance your gaming experience with these simple concave grip add-ons. Accessory Only, Controller is not Included.