It's my understanding that a true Jordan yelper should be river cane and ending with a hen bone mouthpiece. You will see all sorts of configurations out there. Cane/cane/hen or Cane/various wood/hen, etc. A few make a "Jordan style", meaning it's shaped like a Jordan but utilizes some other material for the mouthpiece. I always have one with me because it produces (to me) a slightly higher pitch and slightly different sound than a trumpet.
Check out Ernie Fetters, Ralph Permar, Anthony Ellis, and Mark Sharpe just to name a few. I'm sure I'm leaving someone out on that list, and maybe someone will chime in and recommend a few more. Most of those guys are on here and will be glad to get you going with one.
