Each blaster comes with 5000 7.5mm Dehydrated Gel Balls that are hydrated by soaking in water for up to 4 hours. The gel balls will last up to 2 weeks when stored in an airtight container. Fully submerge the gel balls in water to store up to 3 months. If not stored properly then this will cause the balls to dehydrate and shrink to an unusable size. However, if that happens, simply rehydrate by adding water for at least 2 hours.  Please be sure to empty the magazines after use and ensure the chamber is clear once done using the Gel Force blasters to avoid causing blockage.