Fellowes HFC Free Air Duster 520ml Can/350ml Fill (CRC99749) – Ideal for use on printers, keyboards and other elecrtical equipment – Use in an Upright position only – HFC Free and Ozone Friendly Directions For use: Ensure the equipment is turned off and has cooled down sufficiently before using this product. Use in short brusts, do not shake. Use can in an upright position only. Use extension tube to remove dust in tight areas Material Type: Compressed Gas (152-A)* *Extremely flammable aerosol.Pressurised container for more details go to fellowes link: www.fellowes.com