Wildfire® 18% Pepper Spray is hot, hot, hot. Wildfire is 18% Oleo Resin Capsicum (pepper) — a derivative of 3 million Scoville Heat Units (SHU). The 1/2 ounce units come with an injection molded poly holster, belt clip and keychain. Effective up to 8 feet. Contains 5 one second burst.