Pepper spray enables you to defend yourself while keeping a safe distance from an attacker. A one second burst to the face will cause temporary blindness, choking, coughing, and nausea-bringing the attacker to his knees. The active ingredient in our spray is Oleoresin Capsicum (O.C.), commonly referred to as red pepper. When considering which pepper spray is most effective, one must consider the percentage of pepper being used and the heat rating of that pepper (measured in Scoville Heat Units or S.H.U.). All of our pepper sprays are two million S.H.U., which is the highest available. At 17% and two million S.H.U., our Street Wise pepper spray is the hottest, most powerful in the world. The potency of this spray enables it to bring down even the most aggressive assailants. We offer a wide range of sizes for both civilians and police. This model is just like our best selling 1/2 ounce model but is slightly larger to allow you to use it more often. With the spray attached to your key ring it will be readily accessible.