Demo Accent TR743S Performer Series Intermediate Bb Trumpet •Intermediate Bb trumpet. •Silver-plated finish over yellow brass with silver-plated valve caps and buttons and blue abalone touch pieces for professional sound and appearance. •0.459″ bore with a 4.762″ bell diameter; industry standards for top-level tone production and sound. •Squared (dual) radius on tuning slide favors quicker response and compact sound. •1st slide saddle and 3rd slide fixed ring provides fine intonation control. •Stainless steel pistons for superior durability and smooth operation. •double-braced main tuning slide for added weight and stability.