J T Eaton Insecticidal Bellow Duster #530 Bellow Bulb Hand Duster by JT Eaton is a perfect duster for small dusting applications. This bellow duster has a spring that is compressed in order to release the dust. This duster will hold between 4 oz to 8 oz of dry dust. It would depend on the dry weight of the dust. Has a rod for easy cleaning. Can be held upright, or inverted for better dust dispersion. Fill the bellow duster half way with a dust such as CimeXa Dust, D Fense Dust, Delta Dust , Drione Dust or other dusts. When you squeeze the duster, the dust will come out of the end tip.This will allow you to inject dust into places like wall voids, light switch plates, and crack and crevices or any other places insects like to hide.