The JTR710 pocket trumpet is gold lacquered with a standard size bell and redesigned 3rd loop. You'll be able to produce just as powerful a sound while only having to carry around a trumpet a fraction of the size. FEATURES: Stainless Steel Pistons have remarkably smooth, fast action for improved agility and playability Lacquered Brass Body is produced using state of the art technology to ensure an instrument of the most accurate scale and playability The Wood-Frame Case boasts a classic look that offers excellent instrument protection whether home or on the road. Bore Diameter: 0.460 inches (11.68 mm) 1. Bell Diameter: 4.8 inches (123 mm) 12. Leadpipe Taper: Standard 1. Leadpipe Material: Yellow brass 1. Body Material: Yellow brass 1. Slides: Yellow brass 1. Slide Adjustments: 1st valve saddle