"Koh HEPA JET II - The Original and the Best. Developed by a biomedical engineer and chemist, this is the ultimate bulb blower that ensures you blow only pure air into your sensitive equipment. Patents Pending. Why take chances with conventional bulbs? Conventional bulbs draw air directly from the environment with no filter. It's literally injecting concentrated air full of dust right onto your camera chamber. Dust accumulates in the sides of the chamber and eventually attaches to your sensor. Protect Your Investment You've spent hundreds if not thousands of dollars on your digital SLR camera. The eye of the camera is the sensor. Dust and humidity pose the greatest challenge to keeping the sensor clean. The Koh Hepa Jet blasts unwanted dust off the sensor without introducing dust or humidity into the camera chamber. The replaceable HEPA filter removes humidity and 99.97% of air particles. The respirator grade filter is made of antimicrobial fiberglass filaments that do not form mold, bacteria, or fungus. The pleated sheets create an enormous surface area so that air flows flows fast with low resistance, giving the HEPA JET quick bounce. Unlike single plane flat disk filters, pleated HEPA filters have longevity. Under normal use, you may never need to replace the filter. Our test model has been going strong for over three years. The HEPA Jet has an ergonomic bulb that is made of medical grade PVC that is comfortable and hypoallergenic."