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Estes B4-4  Standard 18mm Rocket Engines (3-Pack) Estes Standard 18mm Engine 3-Pack.  Standard Estes engines fit the standard BT-20 body tube and are 2.75″ (7.0cm) long and 0.69″ (18mm)  in diameter. 
3 pack includes engines, instructions, igniters, and igniter plugs.

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Quality Estes B4-4 Rocket Engines (Est1602) for your collection.