Arctic Freeze Ultra Synthetic Refrigerant 134a+ (14 ounces)(CA Compliant) The Arctic Freeze synthetic refrigerant kit has a specially designed formula featuring Cool Boost that helps a vehicle s A/C produce colder air. The approximately 18 oz. of R-134a and 4 oz. of additives are used to recharge a vehicle s A/C system seal common leaks in rubber components and help extend the A/C system s life by eliminating acid and moisture buildup. This A/C recharge kit comes with a reusable push button charging hose and gauge. This item contains R-134a.