Come and read about this revolutionary proprietary, octagon chamber design with chamber panels. Nothing ever seen like this in the mouthpiece world. Hand finished by Brian Powell and Erik Greiffenhagen.  Theo Wanne wrote me to tell me how innovative and cool this idea was. That says the world to me! Come to my 10MFAN site and read all about these. I have one for alto and tenor to start, and many more models will be coming out.