4 Ounce Wildfire Spray Wildfire 18% is an improved formula that reacts quickly and effectively to disable any assailant. It is 18% and 3,000,000 Scoville Heat Units (SHU). The 4 ounce Wildfire Pepper Spray comes in either a stream or fogger model. Wildfire Pepper Sprays can not be shipped to New York, Massachusetts, Michigan or Wisconsin. WF-18-4