This 3 oz. Streetwise 18 pepper spray is a great size, being large enough to handle any situation, yet small enough to stick in a pocket or purse; Making it perfect to take anywhere you need to go. Streetwise 18 Pepper Spray has a CHR of over 180,000 SHU (1.19 Total Capsaicinoids) making it one of the hottest, most effective self-defense sprays on the market. For comparison, the independent laboratory tested competing brands. They found the average heat rating to be 123,000 SHU, making Streetwise 18 over 46% hotter than the competition!