Review on BelugaDesign Pastel Button Caps and D-Pad for Nintendo Switch Standard OLED Joy-Con Controller Covers - White, Compatible with Directional & A/B/X/Y Buttons by Tyrone Carter

Good product although a bit difficult to apply with sticky pads. I had to use my nail to hold one end on the button as I peeled it off to keep the sticky pads on the buttons. So far everything works and the buttons are still responsive. If one of the buttons isn't responding, you can also apply more stickers (since you get 20).