Over the years, Osmun Music has modified hundreds of trumpet mouthpieces for our orchestral trumpet customers. We have designed a series of mouthpieces that encompass the most popular sizes and modifications that will suit the orchestral trumpeter. The Symphonic Series Trumpet Mouthpieces were specifically designed for C trumpet (they work just as well on Bb) to make intonation more manageable and produce the desired orchestral sound. We designed the mouthpieces with the most requested modifications, size 24 throats and our Osmun Symphonic sized backbores. Because we initially make the Symphonic Series Mouthpieces with those modifications, the entrace of the throat has a smoother transition and the length of the throat is precise. Osmun Music uses CNC technology to manufacture the Symphonic Series, so not only are they consistent, but can be easily modified if a customer wanted a slightly different spec(s). The Osmun Symphonic Series are availible in three diameters(1C, 1.25C, and 1.5C). All mouthpieces have the same medium-deep "C" style cup and traditional style rim. Availible in silver or gold.