4.0" Diameter

Mad Cow Flying Model Rocket Kit 4.0" Squat(54mm) MAD K-3158

Mad Cow Flying Model Rocket Kit 4.0" Squat(54mm)  MAD K-3158 Features: High Power Rocket

Mad Cow Flying Model Rocket Kit 4.0" Seawolf(38mm) MAD K-3135

Mad Cow Flying Model Rocket Kit 4.0" Seawolf(38mm)  MAD K-3135 Features: High Power Rocket