Why is that interesting? I knew that they were drivers and that they were in good shape plus the price was great. I have a couple of Discraft disc that I know very little about. As for my Innova discs the only knowledge I have about them is what the Innova website says. The discs may do what they say and they may not for me depending on technique, skill level, and what I personally try to use them for. So, basically every disc I have ever had, I really knew very little to nothing about until I started to throw them and even then it took some time before I got to know the particular disc that I was using. Specific knowledge about a specific disc is not a prerequisite in order to use that disc. The only knowledge you need is how to throw one.