Guard Alaska Bear Spray utilizes a super hot pepper spray that has been proven very effective in repelling bears. It is the only spray that has been registered with the EPA as a repellend for ALL bear species. This is hands down the most effecitve bear repellent spray available. It is safe for the environment and does not contain any flammable or ozone damaging components. Endorsed by the Alask Science and Technology Foundation. Maximum effective range is 20ft. BIG 9oz canister. Measures 8 3/4 inches by 2 inches.