A long time ago when I was kinda new to spring gobbler hunting me and a friend were looking for some new style turkey calls. We called Knight & Hale..can't remember which one we talked to, but he said he had some new calls they were coming out with called Tube calls. He mailed us some of them. Those were the first ones I had ever seen.
We made tube calls out of a pc of PVC and made what was called Snuff Can calls the same way.
I got one from Primos that I can call good on and sounds great.
I can use them, but not good enough to depend on.
Turkey wing calls are the only calls I've tried I can't use. It would take me a whole lot of practice on those.