Bear adjustable arrow plate covering?

[Red Dwarf]

I have a '71 Bear T/D with an adjustable arrow plate and am wondering what material the factory put on the plate as a finish for the arrow to rub against?

Red Dwarf

[OldSkoolArcher]

I have seen two different coverings. One is a very very thin leather like covering and another is a thin rubbery covering with horizontal lines.

[OldSkoolArcher]

Not the best pic, but you can somewhat see the leather like covering in this pic of my A-Handle.

[OldSkoolArcher]

Quick pic of the rubber cover I mentioned above.