Lonnie makes different sizes of the same call. The top row, left to right, has a Hot Hen with 3 1/4 inch playing surface, a Hot Hen with a 3 1/2 inch playing surface, and a Raspy Boss Hen that has a 3 1/4 inch playing surface. The green glass calls on the second row all have different sized playing surfaces. The 3 1/4 inch Hot Hen called in over a dozen gobblers one year to the gun. It almost become an unfair advantage that year. When I run the call something was coming. I semi-retired it after that. The pot call on the bottom row is an aluminum call. One of the best kee kee pots I have seen.