I've done something stupid and messed up this part on 2 carbs. I know it is not a part replaced in a normal rebuild. Any idea what it is called? I'm hoping it is avaliable as a replacement part.

Found a diagram, appears to be the accelerator pump nozzle. Guess I'll find out tomorrow how hard it's going to be to get a couple of them.

what is this out of? and how is it damaged?

Yamaha warrior. I damaged it by breaking up the inner part which I thought was a removable jet.