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The World's most advanced multi-stage water rocket kits, for STEM educational use. One-, two-, three- and four-stage rockets with spin launcher, auto-rotating lander payload, audible safety pressure-limiting valve, 2-axis levelling system for extreme vertical flight, split-second staging, and horizontal belly-flop descent for all stages. Design has been kept simple and easy for students to understand once they see and use it. For use with a cordless electric compressor or a sturdy bicycle pump. Available from stock at https://waterockets.com.