The Estes b6-4 engine is single stage engine Designed for model rocket flight. This engine is a standard engine Designed for flights in rockets weighing less than 4 ounces, including the engine. Each package includes 3 engines, 4 starters and 4 plugs. This product is warranted by Estes against defects in materials or workmanship from one year of the original purchase. Please retain the warranty information Included in the package so that you may reference It in the event that you receive a defective or malfunctioning product. ***Please Note: this product can only ship via USP
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