I can't remember right off hand the od or the thickness of the bands I gave Bill. If I had to guess I would say around 3/8" to 1/2" thick and probably 1 1/4" to slightly bigger od .
That call looks great Bill ! have ya tried to taper the edges of the antler yet? I taper all of mine to give them a smooth edge.Stinks when turning them down and drilling them but I do like the way they look on a call.