I'm a bari Sax player and was looking to order a metal mouthpiece for jazz. I basically chose the cheapest model I could find. (Runyon $130) It gives me two separate models to buy, but it doesn't say how they differ. I just basically need to know what the difference is between model 5 and model 9, and whether or not this is a good buy. I can't post a link to it here, but if you search "Runyon metal baritone saxophone mouthpiece" and click the guitar center one you will see it. Thanks for the help ahead of time.