Estes 10019 B4-4 Bagged Rocket Engines with Starters and Plugs (3 Pack) Toggle Switch - SPST 1/pkg - 4" (10

1/pkg - 4" (10

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Estes 10019 B4-4 Bagged Rocket Engines with Starters and Plugs (3 Pack) Toggle Switch - SPST 1/pkg - 4" (10Estes 10019 B4 4 Bagged Rocket Engines with Starters and Plugs 3 Pack The Estes B4 4 is a reliable, single stage 18 mm engine designed for model rockets weighing under 3. 5 ounces. With a balanced 4 second delay, it's a perfect fit for smooth, stable flights and consistent recovery deployment. Each 3 pack includes three engines, four starters, and four starter plugseverything you need for several successful launches. Ideal for hobbyists and STEM