Safety Air Horn Mini 1oz Our new formulation (152a) Operates as effectively as our other horn propellants. This new option is flamable though much less than butane. This propellant has a low GWP, 90% lower than HFC 134a. Provides up to 12 blasts per can Provides 112Db blast at 10ft. Meets U.S. Coast Guard requirements for boats up to 39'. Environmentally Safe.