Kraven, ithica just about covered it! but if your looking for a special friction type call i have a freind in kentucky who makes calls they are double glass calls and the unique thing about them is most companies mass producing calls elevate the slate or glass from the bottom of the pot for resinence (sp) with glue in sticks or some kind of material to elevate the slate/glass Pat, makes his calls by routing the bottom of the pot so its all one piece and he also has a unique way of inserting the glass which he would kill me if i told ya ! so i wont but if you want one of the finest calls ive ever used then this is it! he also makes them in a variety of different woods and with different striker combos! not only are they beatiful works of art they are very functoinal and proven! all orders are custom and each call is made specifaclly for the individual with your name on it!
just a thought!