4"/98mm Cluster Centering Ring for two 38mm motor tubes. 1/4" plywood.

Fits into any 4" airframe. Works best with Rocketarium 38mm (S), LOC and Madcow 38mm Cardboard Tube, Blue Tube (41.6mm motor tube OD)

- 41.6, - 98.9mm,  6mm,  21g