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The ACEV4B Evolution features a .459-inch bore with a unique gap regulator on the mouthpipe for excellent response and note slotting plus a 5-inch handmade one-piece bell for superior projection. The Evolution Series also features 1st and 3rd valve finger rings and premium Monel valves.
- Key of Bb
- .459" bore
- 5" handmade one-piece bell
- Monel valves; 1st and 3rd valve finger rings
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