Is it the teflon mouse tape?
I have tried a lot of stuff like that, the issue I had with the tape was that it kept wearing out really quickly, of course I use low sensitivity and move the mouse like a mad man. In the end I found out that a lot of really good players don't use anything like that and I found that using that stuff did not really help me personally. I have heard of people that have said it's helped them but it didn't really help me