The Gel Beads for RoboMaster S1 from DJI are specifically designed to work with the RoboMaster S1 tank. These customized gel beads come in a unique color that enhances their trajectory effects when fired. Made primarily of sodium polyacrylate crosslinking copolymers, the beads are safe and non-toxic, offering a fun and safe experience for users. To prepare, simply soak the beads in clean water for 3 to 4 hours. The package includes two bottles, providing a total of approximately 20,000 gel beads, so you can keep the action going for longer periods of time.