Bell Size: 203mm (8")
Bore: Dual Bore 12.7/13.3mm (.500"/.525")
Water Key: Lever 1
Body: Yellow Brass
Dual Bore Trombone
I am going to be forced to do what I said was the excuse for buying this horn . Use it to replace my straight horn and my 547 bore horn . It does everything both horns will do . Well built and packed well for the trip on FedEx.