Trombone and Euphonium Mouthpiece Benge 6 1/2AL For large shank Compared to the Bach model of the same type, the cup is slightly shallower, and the backbore seems wider, producing a bright, energetic, and powerful sound. It's old, so there are minor scratches, dents, and dirt, and the plating on the shank is peeling, but there's nothing that would interfere with playing. I think it's in reasonably good condition. Since there is no original box, it will be wrapped in bubble wrap for shipping.