YAMAHA BL-59GP Bass Trombone Mouthpiece, Gold-Plated Custom, Slightly Thin Rim, Rich Resonance Even at Pedal Tones, Rim 27.22mm, Throat 7.25mm

---------------------------------------------------------------------- Rim inner diameter (mm): 27.22 Throat diameter (mm): 7.25 Pure gold plated custom mouthpiece It has a slightly thin rim, which does not compromise the rich resonance even with pedal tones.