Def-Tec 5249A First Defense 360 MK-4.4% Stream The MK-4 canister size delivers our MC% formula that is non-flammable Electronic Discharge Weapon (EDW) safe. The First Defense 360 system delivers consistent stream pattern at any angle any orientation. High quality is ensured through an ISO rated manufacturing facility. Independent laboratories confirm these products are consistently made to exacting standards. The yellow color band denotes the.4% MC% formula. When using flip top safety/activator, this stream will travel 10-12 feet. This minimizes cross contamination assists in targeting one person. This type of application will target the skin eyes. The MK-4 canister size will deliver 11-12 short bursts.