/euphonium large shank Jc Custom Ultra 53. External Edge: 38.10 mm. Internal Edge: 27,00 mm. /euphonium large shank Jc Custom Ultra 53" is in sale since Wednesday, August 3, 2016. This item is in the category "Musical Instruments & Gear\Brass\Parts & Accessories\Mouthpieces".The seller is "dicord-us" and is located in Joinville, SC. This item can be shipped worldwide.