These thumb treadz game controller enhancements for the new Nintendo Switch joy-con controllers have been specifically designed to increase gaming comfort, endurance and efficiency. The ergonomically textured rubber grips fit over the analogue sticks on your Nintendo Switch joy-con controllers. In doing so they will improve your thumbs grip on the sticks, giving you a more competitive edge when it matters most. Also ensuring maximum comfort during those longer gaming sessions. The thumb grips fit all original Nintendo Switch joy-con controllers- please note, they are not compatible with the Switch Pro Controller.