This is a 37mm Mil-Spec. Long Range Green Smoke Grenade. These 37mm smoke grenades are manufactured by ALS Technologies, and are currently being used by our military in Iraq. These 37mm smoke grenades can be fired from any 37mm launcher. They will shoot approximately 150 yards down range and will release a thick cloud of green smoke for 30 seconds. These 37mm grenades are the real deal, they are manufactured to U.S Mil-spec. using an all metal casing. These Grenades are used for training and screening purposes and are also very effective in creating a diversion for certain tactical operations. These Grenades are very hard to come by and in short supply.