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 have combined the stopping power of our 17% pepper spray with a temporarily blinding blast of foam. Pepper foam is much heavier than pepper spray and is less susceptible to being affected by the wind. When sprayed, the foam expands over 600% of it's original volume, totally engulfing the face of the attacker. This unit attaches to your key ring so that it will be easily accessible. Other models are available with Pepper Foam but must be ordered in quantities at least 50 units. Please call for more information.  The pepper spray cannister measures in at  3 and three-sixteenth inches x five-eights inches x five-eights inches.  The included holster measures in at  5 inches x   1 and one-quarter inches x 1 inch (including the key ring).