AW Distributing, Inc. UDS-10MS-P12 Ultra Duster (Pack of 12) 10 oz. cans blast away any dust, dirt, and unwanted micro articles from computers, keyboards, printers, and other electronic equipment's. Containers no CFCs (Freon). contains a bitterant additive that discourages potential abusive and misusage of the product by making its contents unpleasant to inhale