The Gary Fong Lightsphere II Inverted Dome Flash Diffusion Starter System includes the C4 and P4 Lightsphere IIs with the standard inverted domes.
The Lightsphere is a large, round, soft and flexible diffuser that slips over the front of compatible flash units. The inside of the Lightsphere is completely textured to make the light dispersion even more "soft" than it would be otherwise. And because of this design, it is possible to make the material more translucent, keeping the unit from losing a lot of light while actually increasing the diffusion and softness of light.
An opaque color has been added to the inside of the Cloud version, and this "frosted" version creates an even softer effect, which makes it ideal for close-ups, portraits, and event photography.