.459” Bore
4-13/16" Seamless yellow brass bell
Gold brass leadpipe with a nickel silver mouthpiece receiver
Nickel silver outside slide tubing
Monel pistons with single point valve guides
1st slide thumb saddle and adjustable 3rd slide ring
Waterkeys on main and 3rd valve slide
Clear lacquer finish
Bach 7C mouthpiece
50917 is a durable ABS molded plastic case
* Also available in a Silver-plated finish as model BTR311S