Likely one of the lowest members of the Saxophone family. Stands at around 6 1/2 feet tall and weighs around 45-50 pounds. Less than 30 are believed to exist worldwide.
Has a wide range and a broad, mellow tone. Lower notes can be low enough to sound alike to human ears. Generally not specifically needed but a nice addition to most symphonies, if they can find one...
Should you go looking for this elusive beast, a good place to start would be the Eppelsheim company based out of Munich. Retail price is will set you back about $25,000-$30,000.
Guy 1: What is that you're playing?
Guy 2: It's a Contrabass Saxophone.
Guy 1: Whoah...
Guy 2: Yup. I had to mortgage my house and use my kid's college money to afford it, but it was soooo worth it.