I suggest the Vandoren BD5 Black Diamond Ebonite. I’m a clarinet major at my university and after trying out different mouthpieces that my professor had me use, I found it has the best quality. Below is a link for it on Amazon. I hope this helps!
Vandoren CM1005 BD5 Black Diamond Ebonite Bb Clarinet Mouthpiece https://www.amazon.com/dp/B00WGD672E/ref=cm_sw_r_cp_api_i_K.U4Cb7VJKFBJ
It seems that your comment contains 1 or more links that are hard to tap for mobile users. I will extend those so they're easier for our sausage fingers to click!
Here is link number 1 - Previous text "BD5"
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