Estes 1616 C6-0 Booster Stage Model Rocket Engine Pack – 3 Engines with Starters & Plugs it is the perfect size

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Estes 1616 C6-0 Booster Stage Model Rocket Engine Pack – 3 Engines with Starters & Plugs it is the perfect sizePLEASE NOTE: These are 18mm diameter booster stage engines for multi stage model rockets. Please refer to the instructions that came with your rocket (or the rocket's product description) to determine engine compatibility. Estes C6 0 engine pack includes 3 engines, 4 starters, and 4 starter plugs The C6 0 is a booster stage engine that has to be used in combination with a regular engine of the same diameter. This engine is for flights in rockets