The Flashpoint Replacement Glass Dome for Rapid 600 Flash Head protects the delicate flashtube and evenly distributes the light without affecting the intensity or color temperature and does not obstruct the modeling lamp. Vent holes prevent the heat of the strobe to build up during shoots and extend the life of the tube. This dome fits firmly into place over the flashtube assembly with two grip bandson the head. Keep one around for a rainy day or when your assistant has had a fit. Just in case.