Relationshipware DIY Launcher + StratoFins Water Rocket Kit Features easy to assemble prefabricated parts, durable ABS plastic launch pad, & an adjustable trigger. Kit includes DIY launcher, StratoFins (screw-on water rocket fins), 2 tent pegs, & easy instructions. DIY Launcher will enable you to propel a 2 liter plastic (PET) soda pop bottle over 350 ft. in the sky. Supports most .5L, 1L, 1.25L & 2 liter soda bottles @ air pressures as low as 20 PSI up to 120 PSI Water rocket (2 liter soda bottle), parachute, and nose cone are NOT included in this kit.