Rubber Mpc

What do 5, 5*, 6, 6* mean?
I’m looking at buying an Otto Link Hard Rubber Bari Mpc and i need to decide whether i want 5, 5*, 6, 6*, 7, 7*, or 8. What does this mean, and which one would you recomend? I’ve previously played on a Yamaha 5C (when i had a yamaha horn), and currently a standard yanigasawa mpc (on my current yani).
~Thanks
I’m a little confused by your question because I’m not sure that Bari makes an Otto Link signature mouthpiece. Perhaps you are saying you want an Otto Link Tone Edge Hard Rubber Mouthpiece for a Bari (baritone sax). Anyway, the 5, 5*, 6, 6*, 7, 7*, 8 is a reference to the Facing which corresponds to the Tip Opening. So, you need to know what tip opening size you have on your Sax now and order the appropriate number for the Facing in order to get that Tip Opening size. Here is a chart that explains more and provides the corresponding Tip Opening sizes for each of the Facing numbers above:
http://www.saxplus.com/ottolinkrubber.html
Mpc 1000 Beat – Tripped Out Rubber Duck Race