Review on Fosmon (Pack of 4) Analog Stick Thumb Grip Controllers for Improved Performance, Compatible with PS5, PS4, Xbox One, Xbox Series X/S (Black/Green) by Amy Arakaki

They're just too big for X series X controllers. Keeps falling off. Especially if you're despotic like me. They only get two stars for advertising it as XSX compatible and that really annoys me. However, they fit my old X-One style controllers, which I would recommend for the price. The Xbox Green border also pairs well with black controllers. Can't speak for PS controller.