Fox Labs Pepper Spray Grenades are hand held throwing units with a lock on top for continuous discharge. After they are activated, they will spin in a 360 degree circle on hard flat surfaces completely expelling their contents in about 10 seconds. They are ideal for control and disbursement of crowds or securing a confined area.The 2 oz. unit will empty itself in about 10 seconds.The 4 oz. unit will empty its contents in about 28 to 30 seconds.All units disperse the 2% 5.3 MM SHU formula in a fine mist for maximum effectiveness. Also contains UV dye that will fluoresce under ultraviolet light for identification of those who were at the scene.