First Defense 1.3% MK-4 Foam OC AerosolThe 3 oz. MK 4 canister will deliver 20 25 short bursts of OC at an effective range of 10 12 ft.? The foam delivery method is a powerful and fast acting foam that coats the face upon contact.? The 1. 3% MC blue banded canister indicates the major capsaicinoid level which is discharged at the nozzle at time of use.? The MK 4 is an ideal size for patrol officers to wear on a duty belt.? This formulation has been tested and is non flammable and