16PCS Silicone Analog Controller Thumb Stick Grips Cap Cover For PS4 PS3 Xbox One Game Accessories Replacement Parts Enough to keep your fingers from slipping Add a little extra grip and comfort to your game play Thumb Grips For Sony Play Station 4 PS4 PS3 Xbox One Along with the silicone caps, you will have the extra leverage and precision you crave; Please note that only the white caps are luminous which can glow in dark.The black caps are not luminous;