These are Military Grade 37mm smoke rounds. They are available in Red, and white
Description: The Long Range, White Smoke cartridge launches one Long Range pyrotechnic sub-munition that releases a white smoke agent. The single sub-munition provides a wide area of coverage for training, smoke screening and other applications. The sub-munition is launched up to 150 yards and releases smoke for approximately 25-30 seconds. Hazmat item.