Ultra Duster™ Industrial Strength Compressed Air Duster Cleaner, 10 oz Can, 12/Carton (ULDUDS10P12C) Case of 12Will safely blast away any dust, dirt and unwanted micro articles from computers, keyboards, printers and other electronics equipment, Will not leave any residue. It effectively cleans by reaching those hard to clean areas and therefore helps maintain premium levels for electronic devices. Ultra Duster contains no CFCs (Freon). A bitterant additive discourages potential abusive and misusage of the product by making its contents unpleasant to inhale.