2.5 X 29mm plywood model rocket centering rings. Baltic birch. Estes PS ll

2.5  X 29mm plywood model rocket centering rings. Baltic birch. Fits Estes PS ll 2.5 inch tubes and Heavy 29mm tubes set of 3
2" rings also available. 
Also available with TTW notches in any size up to 4 inch. 
I can make you custom rings of almost any size. Please message me any requests.