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ENGINE CENTERING RINGS (5) 18MM ENGINE CLUSTER BT-80 TUBE. You get (2) engine centering rings in a package.  What to really have some fun! Buy this set and watch your rocket soar.  This centering ring will allow you to use 5 18mm type rocket motors and install them into a BT-80 2.60" rocket tube!  Get a set today.  CLICK ON IMAGE TO ENLARGE. Item #M5C2080-F Price: $4.29  Sale price $3.99

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