The First Defense MK3 is a 1.47 oz FIRST DEFENSE unit. This pepper spray unit is 4.25" tall and disburses fifteen 1/2 second stream bursts. The unit incorporates the flip top safety and includes a strip of velcro to fasten the unit to your steering column or a place which is easily accessible. Aerosols are designed for target-specific long-range deployments, with a minimal likelihood of cross-contamination. Their primary effect is on vision. NOTE: Pepper spray over 2.5 oz. may only be sold to law enforcment officers. Defensive spray cannot be shipped outside continental US. Cannot ship to Hawaii, Michigan, New York or Wisconsin. It must be shipped to a physical address, and not a PO box. Ground shipment only.