Geospace Pump Rocket Duo Foam Blaster Squeeze & Shoot with Rockets & Ammo Balls Made of soft, safe foam so it is OK to use both indoors or out. Includes 2 foam "ammo" balls, 2 foam rockets and one Blaster. To shoot, just squeeze the handle which sends a blast of air through the barrel. Choose which ammo type to use depending on the distance of your target. To add extra rockets, look for Geospace Mini Replacement Rockets 8-Pack (sold separately).