Features: Artist .547" (13.89mm) bore with F attachment 8-5/8" (219mm) rose brass bell .525"/.547" (13.34/13.89mm) dual bore slide lacquer finish 6-1/2ALS tenor shank mouthpiece woodshell case. Helps students make a smooth transition to a larger symphonic trombone. Provides larger sound needed in concert band & orchestra while allowing for a true "lead" sound in jazz ensembles. Full warranty. Options: Bright silver plated finish.