The Estes B4-4 Rocket Engine 3-Pack is an 18 mm, single-staged engine designed for model rocket flights. This engine is a standard engine designed for flights in rockets weighing less than 3.5 ounces, including the engine.
 
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WARNING: This product can expose you to chemicals including silica, which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov
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