This Large Replacement Rocket Twin Pack includes two large (SR.-size) 17-inch foam Rockets (assorted colors) to use with your existing PUMP ROCKET SR. or JUMBO JUMP ROCKET launcher. The Rockets are made of soft foam, with super-soft foam tips for safety. More Rockets equals more fun! But also, extra rockets come in handy in case one gets lost, or stuck in a tree, or lands on a roof. These soft, safe foam rockets are waterproof, so if they land in the pool, or get left out in the rain -- no problem! (Please note: the launcher tube/handle that comes with the full Pump Rocket sets are NOT waterproof unless stated; just the foam rockets are waterproof). Colors are assorted: Red, Blue, Purple and Green. Each package includes 2 Rockets of different colors. For use with the following Pump Rocket SR. size launcher items: Geospace item numbers 12900 Pump Rocket SR., 12938 Jumbo Jump Rocket, 12908 Pump Rocket SR. 2-Rocket Set, 12909 Air Striker, 12913 Aerial Catch.