Estes 1504 1/2A3-4T Mini Model Rocket Engines, 4 Count – 13mm with Starters & Plugs Technical Specifications:Measuring Range: 0-12in

Technical Specifications:Measuring Range: 0-12in

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Estes 1504 1/2A3-4T Mini Model Rocket Engines, 4 Count – 13mm with Starters & Plugs Technical Specifications:Measuring Range: 0-12inPLEASE NOTE: These are mini (13mm diameter) engines that will only fit certain model rockets. Please refer to the instructions that came with your rocket (or the rocket's product description) to determine engine compatibility. Estes 1 2A3 4T engine pack includes 4 mini engines, 4 starters, and 4 starter plugs The 1 2A3 4T are made to fit smaller rockets, but they will pack a punch! Recommended for use with the Gnome, Star Hopper, or other compatible