Hey Shane,
Are you talking about a brand name "Hedge Wood Calls" or the material Hedge wood to make them??
I don't know anything if your talking about a brand name

. But if it's the material ... It's a pretty durable wood. The've been making fence posts out of some of it for years because of it's durability in the weather. A friend of mine has a call made of this wood. Great on the bottom end for sound and finness calling. I can't remember the manufacturer's name, I'll have to ask him.
John