Most pepper sprays are between .5 to 2 million Scoville heat units. Fox Labs Pepper Spray is non-blistering and refined to an outstanding 5.3 million Scoville heat units. That is 2.6 to 11 times stronger than most other pepper sprays. That's a whole lot of heat packed into this piece. So go ahead and check this survival tool off your bug out bag list. Emergency preparedness has never been so easy and affordable! Cans contain Ultra Violet Dye. With flip-top safety.