What's inside the F-Ring?!?

Caption NASA:"These 2 images, taken about 8' apart, show clump-like structures and a great deal of dust in Saturn's ever-changing F-Ring. The images show an object-interior to and detached from the bright core of the F-Ring that appears to be breaking up into discrete clumps.
Cassini scientists have been monitoring clumps in the F-Ring for more than 2 years now, trying to understand whether these represent small permanent moonlets or transient aggregates of material. This view looks toward the unlit side of the Rings from about 35° above the Ring-Plane.

The images were taken in visible light with the Cassini spacecraft narrow-angle camera on Dec. 23, 2006 at a distance of approx. 2 MKM (about 1,2 MMs) from Saturn. Image scale is roughly 12 Km (about 7 miles) per pixel".