Eliminate noise from your Air-X and Air 403 wind generators. Silent Power Blades from bluemarinestore provide a high tech solution for the hissing noise from the Air X and the Air 403. Precision engineered from carbon fibre and epoxy resin resulting in a lighter and much stiffer blade for up to 70% less noise. Hand tuned and wind tunnel optimized for less vibration. Can also be used with the Air Breeze. http://www.bluemarinestore.com/silent-power-blades.html