They have been constructed from a robust rubber that grips to the butt of your rod with impressive strength. This grip is greater than most other models available as despite their small size the Fox Butt Grips are actually in contact with more of the butts surface area than most. As mentioned previously they are very small, which when coupled with their minimalistic styling makes them every tackle tarts dream back rest! There are two models available, which are Small for standard abbreviated handles and Large for full Duplon and cork handles.