The Miraphone 186 Pro Series 4/4 BBb Tuba is the world-famous true powerhouse in the tuba world. This Miraphone 186 tuba features a .772 in. bore and 17.7 in. bell designed for excellent projection and intonation. It is available in a professional version with nickel-silver slides and trim in lacquer with 4 valves. A case is not included. The Miraphone 186 Tuba is a standard of the industry and has a great history. Many bass trombonists prefer to play next to a Miraphone 186 as their first choice. The horn has a beautiful rich sound that carries very well and the intonation is right on the mark. The instrument is comfortable to hold and play.