Geospace - Standard PUMP ROCKETS® are a blast to fire, but our BUNGEE BLAST™ JR ramps up the fun and excitement by an order of magnitude. We’ve engineered a patented elastic bungee cord inside the pump cylinder to turbo boost the launching power. Load a foam rocket into one end and pull back the cylinder, feeling the increasing tension of the cord inside. Then let go. Kids will be amazed as the stored energy of the cord pushes the piston of air very forcefully, blasting the rocket out at hyper-speed. It’s like putting a turbo-charger inside!