Safely removes dust, dirt, oxide particles and other dry contaminants from delicate instruments. The high-pressure spray reaches the most inaccessible areas to remove dust instantly without residue. Will not scratch or abrade sensitive surfaces. Zero ozone depletion. Safe for the environment No CFCs andNo HCFCs! Contains HFC (134A) Safe Pressure (only 81 PSI pressure). Meets Federal specs BB-F-1421. Completely dry - leaves no residual film. Filtered to 0.3 microns. Includes a 10 oz. can of Tech Duster "O" with disposable trigger. CARB (California Air Review Board) Restricted - Energized equipment use only.