This is a brass threaded leadpipe made for the Stauffer alto trombone. It should improve centering and response, and will likely improve the feel for most players. Made in Los Angeles, it should fit most stencil brands of the alto trombone made by Jinbao if they have a threaded receiver and removable leadpipe. Brands may include Jinbao, Selman, Roy Benson and others.
These were made for me in California by Kanstul, who is now closed. This is remaining stock only.