Store SBR 3.9" x 54mm Centering Ring $4.29 SBR 3.9" x 54mm Centering Ring $4.29 Model Number: CR454 Maximum quantity exceeded Minimum purchase amount of 0 is required Maximum purchase amount of 0 is allowed 4.290 10000000 Categories: Parts and Accessories Manufacturer: SBR High Powered Model Rockets Description 3.9" x 54mm Laser-cut 1/8" Plywood Centering Ring