Ridenour's clarinets are listed under the Hard Rubber section.

The Ridenour 146 is mostly plastic with a hard rubber barrel. It is excellent. If you find one used, buy it.

The Ridenour 147 is not recommended. See the page linked here for more. 

I am a dealer for NEW Professional Level Ridenour hard rubber clarinets. There are links to buy them are on the review pages. I am very happy with my Ridenour bc-576.