Perhaps you actually meant Slate Surface Peg & Pot Style Calls?
If so, Camp Callers and Cody both make nice Slate Surface calls in Wood Pots. I have a Camp Callers Slate, and a Cody Glass. These two companies make some nice calls.
I have heard that some of the callmakers that advertise on this site do even better work. I don't know personally, but that's the rumor.