The only thing I see wrong with them is they ain't got no latex on 'em?
Andy, you would have to try one to hear how they sound. I got some dental dam from my dentist but Shawn Willians (Treat Mountain Callers) gave me a piece of thinner latex and it sounded a ton better.
Tube call are sort of like diaphrams, sound great if someone knows what they are doing, sounds like crap if someone doesn't.
New to turkey hunting,,,,,,what are these for?