Everdon Rocketry Centering ring W/ Shock cord holes 2.89" x 0.125 for 29mmt ( ESTES Tube & Pro Series II )

Everdon Rocketry Centering ring 2.89" x 0.125 for 29mmt ( ESTES Tube )

For Estes 3" Tubes & Pro Series II

sold as a single,