Apple silicone mobile phone may provide you with a reference.
First of all, the fake apple silicone phone case has a very clear line in the middle. The key color is the same as the overall color. Open-treated. In a very. Crude. The fake ones will see clear cut marks. Especially the fake apple silicone phone case, the logo on the back. It can be separated.
The second is the feel. It must be really good. It's fake. I feel it. Not so good