Flexo Dome is a useful & inventive tool that makes sensor cleaning easier & safer. Simply fit the manufacturer-specific fitting ring to your camera & insert the blower, & you can blast the dust clear without the risk of scratching or damaging the sensor with the end of the blower. Not only is this fantastic for those of us who err on the side of prudence when cleaning sensors, but it also means that you can hold the camera face-down to assist the removal of dust, without having to hold it above you, peering cautiously inside, lest you inadvertently scrape the sensor. A great little gadget that should be in every photographer's toolbox.