Blow Off - Air duster with 152A propellant (defined as non-flammable) 10oz. Is an all-purpose sterilized cleaner that removes dust, dirt and microscopic debris from hard to reach places. It is ozone safe. Recommended for: computers keyboards screwing machines photo equipment cash registers printers fax machines copiers telephones lab equipment TVs vcrs typewriters vacuums shredders scanners stereos watches clocks mailing machines fans audio equipment electric razors sports equipment musical instruments desk tops.