If you're asking about the base.....I have ALOT of them. Almost every lineman I have has one under him. Several defensive backs, linebackers, tight ends do too. They can be tweaked to run forward or backwards, for FLAT-OUT brute strength, VERY good speed, or anything you need to have in a base. I personally couldn't find bases good enough to beat them in the Tornado Alley League, so I bought a bunch, very happy with mine, and I'm likely to replace almost evey other manufactured base I have with F5s. Simply because they are so versatile and reliable.