There are two different seals used in Profile Racing’s cassette hub drivers:
Mini Seal– Used on Mini BMX, Totem BMX, High Flange BMX, & Classic MTB style(4 pawl) Cassette Drivers. It is a standard rubber o-ring.
Elite Seal- Used on Elite BMX & Elite MTB style(6 pawl) Cassette Drivers. It is made of black Nylon and marked “Profile Racing Made in USA”.