I have several Argon One Raspberry Pi 4 cases and love them. The problem is that when removing the RPI from the case, the gray thermal pad often tears. This set of yellow thermal pads are the perfect replacement for the original pads that came with the case. The size and thickness of the pads are identical to the original pads. I don't know about thermal performance, but they certainly perform as well if not better than the originals. When searching for pads other than size/thickness, I looked at the specified W/mk value. These pads are listed as rated at 3W/uOhm, which is higher and therefore better than several other alternatives I've found. I am very happy with my purchase!