Well, with the Eshooter Flare M Tracer Unit, one can shoot rainbows with their airsoft guns as demonstrated by Maydaysan Airsoft... "This is the Eshooter Flare M Tracer Unit. This little guy has been my airsoft tracer of choice for CQB the past few months, and it delivers. It can shoot different colors, and flames, and also light up the BB's really nicely!"