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Steven's International
Estes B4-4 Rocket Engines (EST1602)
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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.
3 pack includes engines, instructions, igniters, and igniter plugs.