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PROBLEM TO BE SOLVED : for an internal combustion engine, including automobile and, by activating the air and the fuel, to improve the combustion efficiency, hydrocarbon or carbon monoxide in the exhaust gas, the reduction of harmful substances such as black smoke in a diesel engine is obtained, which is easy to use than to provide a device for improving combustion efficiency. SOLUTION : and natural ore containing a rare earth metal, and zirconium oxide powder raw material natural ore and urethane coating and a coating material obtained by mixing a metal plate or a resin plate silk printing, without reducing the area through which air passes and in which an opening is provided in the shape of a three-dimensional structure, an air filter of an automobile, it is fixed by using a pin, the injection portion of the engine using the device to be mounted in either the same or the raw material, the raw material is fixed to the air filter by a device such as these, the free radicals are generated by contact with the air, the mixture of the fuel and the combustion efficiency by improving effect is obtained. Selected drawing : fig. 4