Geospace JR. Replacement Rockets 4-Pack for Jump Rocket & Pump Rocket JR. Extra Rockets for use with all Geospace Pump Rocket JR & JUMP ROCKET launchers. Adds more fun since kids can shoot more rockets before having to go retrieve the fired rockets. Replacement rockets are helpful to have in case original rocket gets stuck on the roof or in a tree. Soft foam construction (including super-soft tip) means no "ouchies!"