|Eliminate dust, dirt and debris from those hard-to-reach areas. Simply use the duster and the extension tube to quickly and easily get to tight areas and keep your expensive electronic equipment clean. When used as directed, the duster is moisture-, oil- and residue-free. Environmentally friendly propellant is non-ozone-depleting and contains no HFCs or CFCs. Not to be used on paper shredders or electrical motors as vapors may ignite.