This is the standard #10 leadpipe for the .500" bore Rath R10 trombone. It's brass with a nickel receiver and threaded ring. This pipe is also compatible with the Rath R100 trombone, and in my (limited) experience this R10 pipe makes a huge upgrade to the playing performance of the R100. If you play an R100, try this.
6.19.25: I ordered two of these: one for my new for-sale R100 and one for you. If we need more I'll get some in the queue. Please send an email. Estimated price subject to change.