I have been using its a blast rockets for over 12 years. In fact they were the ones who developed a car launcher for me. In the past we used co2 cartridges to launch our cars at the Jr. high school. Now we launch with an air compressor for free, with no cost to the students. Also, their rockets have been part of my classroom projects for 7th graders for many years. Get staff...and wonderful service!
It really IS a blast!