WILDFIRE 18% PEPPER SPRAY is hot, hot, hot. Wildfire is 18% Oleo Resin Capsicum (pepper) -- a derivative of 3 million Scoville Heat Units (SHU). Wildfire 18% pepper spray comes in 5 sizes: 1/2 ounce (available in red, blue and black), 1.5 ounce, 4 ounce, 9 ounce and 1 pound. 1/2 ounce and 1.5 oz units come with an injection molded poly holster, belt clip and keychain. The 4oz size is the size of choice for security guards and is great to keep around the house for protection. This size is available in either a fog or a stream delivery style. The stream style has a maximum effective range of 18 feet and offer up to 22 one second blasts. The fogger has a maximum range of 18 feet and provides you with up to 20 shots.