The grey banded canister indicates the unique OC/CS formulation which targets the respiratory system. 

The MK-2, MK-3 & MK-4 are an ideal size for patrol officers to wear on a duty belt and will deliver several short bursts of OC at an effective range of 10-12 ft. This OC/CS aerosol product utilizes a stream delivery method providing a target-specific, strong concentrated stream for greater standoff.

• The 1 oz. MK-2 canister will deliver 7-10 short bursts of OC at an effective range of 10-12 ft. 
• The 1.47 oz. MK-3 canister will deliver 10-12 short bursts of OC at an effective range of 10-12 ft.
• The 3 oz. MK-4 canister will deliver 20-25 short bursts of OC at an effective range of 10-12 ft. 
• The stream delivery method provides a target-specific, strong concentrated stream for greater standoff.
• The grey banded canister indicates the unique OC/CS formulation which targets the respiratory system. 
• The MK-2, MK-3 & MK-4 are an ideal size for patrol officers to wear on a duty belt.
• This formulation has been tested and is non-flammable, but is NOT Electronic Discharge Weapon (EDW) safe. 
• Defense Technology® First Defense® OC Aerosols are produced in an ISO rated manufacturing facility.
• All Major Capsaicinoid percentages (MC%) are verified by an Independent Laboratory for quality assurance.